15818972 has 12 divisors (see below), whose sum is σ = 29812776. Its totient is φ = 7301040.

The previous prime is 15818953. The next prime is 15818977. The reversal of 15818972 is 27981851.

15818972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15818977) 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, 152054 + ... + 152157.

It is an arithmetic number, because the mean of its divisors is an integer number (2484398).

Almost surely, 2^15818972 is an apocalyptic number.

It is an amenable number.

15818972 is a deficient number, since it is larger than the sum of its proper divisors (13993804).

15818972 is a wasteful number, since it uses less digits than its factorization.

15818972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304228 (or 304226 counting only the distinct ones).

The product of its digits is 40320, while the sum is 41.

The square root of 15818972 is about 3977.3071292019. The cubic root of 15818972 is about 251.0302657112.

It can be divided in two parts, 158 and 18972, that multiplied together give a triangular number (2997576 = T₂₄₄₈).

The spelling of 15818972 in words is "fifteen million, eight hundred eighteen thousand, nine hundred seventy-two".