15978912 has 48 divisors (see below), whose sum is σ = 44416512. Its totient is φ = 5012480.

The previous prime is 15978899. The next prime is 15978923. The reversal of 15978912 is 21987951.

15978912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3264 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (925344).

Almost surely, 2^15978912 is an apocalyptic number.

15978912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

15978912 is the 3264-th pentagonal number.

It is an amenable number.

15978912 is an abundant number, since it is smaller than the sum of its proper divisors (28437600).

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

15978912 is a wasteful number, since it uses less digits than its factorization.

15978912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9821 (or 9813 counting only the distinct ones).

The product of its digits is 45360, while the sum is 42.

The square root of 15978912 is about 3997.3631308651. The cubic root of 15978912 is about 251.8734562440.

The spelling of 15978912 in words is "fifteen million, nine hundred seventy-eight thousand, nine hundred twelve".