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1999980 = 2232541271
BaseRepresentation
bin111101000010001101100
310202121110100
413220101230
51002444410
6110511100
722666563
oct7502154
93677410
101999980
111146684
12805490
13550428
143a0bda
152978c0
hex1e846c

1999980 has 72 divisors (see below), whose sum is σ = 6237504. Its totient is φ = 518400.

The previous prime is 1999979. The next prime is 1999993. The reversal of 1999980 is 899991.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7245 + ... + 7515.

It is an arithmetic number, because the mean of its divisors is an integer number (86632).

21999980 is an apocalyptic number.

1999980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3118752).

1999980 is an abundant number, since it is smaller than the sum of its proper divisors (4237524).

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

1999980 is a wasteful number, since it uses less digits than its factorization.

1999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 1999980 is about 1414.2064912876. The cubic root of 1999980 is about 125.9916850144.

1999980 divided by its sum of digits (45) gives a palindrome (44444).

It can be divided in two parts, 19 and 99980, that added together give a palindrome (99999).

The spelling of 1999980 in words is "one million, nine hundred ninety-nine thousand, nine hundred eighty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 30 36 41 45 60 82 90 123 164 180 205 246 271 369 410 492 542 615 738 813 820 1084 1230 1355 1476 1626 1845 2439 2460 2710 3252 3690 4065 4878 5420 7380 8130 9756 11111 12195 16260 22222 24390 33333 44444 48780 55555 66666 99999 111110 133332 166665 199998 222220 333330 399996 499995 666660 999990 1999980