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1999984 = 24722551
BaseRepresentation
bin111101000010001110000
310202121110111
413220101300
51002444414
6110511104
722666600
oct7502160
93677414
101999984
111146688
12805494
1355042c
143a0c00
152978c4
hex1e8470

1999984 has 30 divisors (see below), whose sum is σ = 4509384. Its totient is φ = 856800.

The previous prime is 1999979. The next prime is 1999993. The reversal of 1999984 is 4899991.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an Ulam number.

It is a plaindrome in base 11.

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 492 + ... + 2059.

21999984 is an apocalyptic number.

1999984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1999984 is an abundant number, since it is smaller than the sum of its proper divisors (2509400).

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

1999984 is a wasteful number, since it uses less digits than its factorization.

1999984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573 (or 2560 counting only the distinct ones).

The product of its digits is 209952, while the sum is 49.

The square root of 1999984 is about 1414.2079055075. The cubic root of 1999984 is about 125.9917690096.

It can be divided in two parts, 199998 and 4, that added together give a palindrome (200002).

The spelling of 1999984 in words is "one million, nine hundred ninety-nine thousand, nine hundred eighty-four".

Divisors: 1 2 4 7 8 14 16 28 49 56 98 112 196 392 784 2551 5102 10204 17857 20408 35714 40816 71428 124999 142856 249998 285712 499996 999992 1999984