15972136 has 8 divisors (see below), whose sum is σ = 29947770. Its totient is φ = 7986064.

The previous prime is 15972119. The next prime is 15972149. The reversal of 15972136 is 63127951.

It can be written as a sum of positive squares in only one way, i.e., 9180900 + 6791236 = 3030^2 + 2606^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998251 + ... + 998266.

Almost surely, 2^15972136 is an apocalyptic number.

It is an amenable number.

15972136 is a deficient number, since it is larger than the sum of its proper divisors (13975634).

15972136 is a wasteful number, since it uses less digits than its factorization.

15972136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996523 (or 1996519 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 15972136 is about 3996.5154822670. The cubic root of 15972136 is about 251.8378481491.

The spelling of 15972136 in words is "fifteen million, nine hundred seventy-two thousand, one hundred thirty-six".