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1999998 = 2337111337
BaseRepresentation
bin111101000010001111110
310202121111000
413220101332
51002444443
6110511130
722666620
oct7502176
93677430
101999998
1111466a0
128054a6
13550440
143a0c10
152978d3
hex1e847e

1999998 has 128 divisors (see below), whose sum is σ = 6128640. Its totient is φ = 466560.

The previous prime is 1999993. The next prime is 2000003. The reversal of 1999998 is 8999991.

It is an interprime number because it is at equal distance from previous prime (1999993) and next prime (2000003).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54036 + ... + 54072.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

21999998 is an apocalyptic number.

1999998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3064320).

1999998 is an abundant number, since it is smaller than the sum of its proper divisors (4128642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999998 is a wasteful number, since it uses less digits than its factorization.

1999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 73 counting only the distinct ones).

The product of its digits is 472392, while the sum is 54.

The square root of 1999998 is about 1414.2128552661. The cubic root of 1999998 is about 125.9920629921.

It can be divided in two parts, 1 and 999998, that added together give a palindrome (999999).

The spelling of 1999998 in words is "one million, nine hundred ninety-nine thousand, nine hundred ninety-eight".

Divisors: 1 2 3 6 7 9 11 13 14 18 21 22 26 27 33 37 39 42 54 63 66 74 77 78 91 99 111 117 126 143 154 182 189 198 222 231 234 259 273 286 297 333 351 378 407 429 462 481 518 546 594 666 693 702 777 814 819 858 962 999 1001 1221 1287 1386 1443 1554 1638 1998 2002 2079 2331 2442 2457 2574 2849 2886 3003 3367 3663 3861 4158 4329 4662 4914 5291 5698 6006 6734 6993 7326 7722 8547 8658 9009 10101 10582 10989 12987 13986 15873 17094 18018 20202 21978 25641 25974 27027 30303 31746 37037 47619 51282 54054 60606 74074 76923 90909 95238 111111 142857 153846 181818 222222 285714 333333 666666 999999 1999998