15995988 has 48 divisors (see below), whose sum is σ = 42602560. Its totient is φ = 5186592.

The previous prime is 15995953. The next prime is 15996011. The reversal of 15995988 is 88959951.

It is a super-2 number, since 2×15995988² = 511743264192288, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995 + ... + 5997.

Almost surely, 2^15995988 is an apocalyptic number.

15995988 is a gapful number since it is divisible by the number (18) 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 15995988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21301280).

15995988 is an abundant number, since it is smaller than the sum of its proper divisors (26606572).

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

15995988 is a wasteful number, since it uses less digits than its factorization.

15995988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053 (or 4045 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 54.

The square root of 15995988 is about 3999.4984685583. The cubic root of 15995988 is about 251.9631465381.

The spelling of 15995988 in words is "fifteen million, nine hundred ninety-five thousand, nine hundred eighty-eight".