15978252 has 12 divisors (see below), whose sum is σ = 37282616. Its totient is φ = 5326080.

The previous prime is 15978239. The next prime is 15978253. The reversal of 15978252 is 25287951.

It is a tau number, because it is divible by the number of its divisors (12).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 15978252.

It is not an unprimeable number, because it can be changed into a prime (15978253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665749 + ... + 665772.

Almost surely, 2^15978252 is an apocalyptic number.

15978252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15978252 is an abundant number, since it is smaller than the sum of its proper divisors (21304364).

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

15978252 is a wasteful number, since it uses less digits than its factorization.

15978252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331528 (or 1331526 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 15978252 is about 3997.2805755914. The cubic root of 15978252 is about 251.8699883656.

The spelling of 15978252 in words is "fifteen million, nine hundred seventy-eight thousand, two hundred fifty-two".