15967972 has 6 divisors (see below), whose sum is σ = 27943958. Its totient is φ = 7983984.

The previous prime is 15967949. The next prime is 15967993. The reversal of 15967972 is 27976951.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 4024036 = 3456^2 + 2006^2 .

It is a super-2 number, since 2×15967972² = 509952259585568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995993 + ... + 1996000.

Almost surely, 2^15967972 is an apocalyptic number.

It is an amenable number.

15967972 is a deficient number, since it is larger than the sum of its proper divisors (11975986).

15967972 is a wasteful number, since it uses less digits than its factorization.

15967972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991997 (or 3991995 counting only the distinct ones).

The product of its digits is 238140, while the sum is 46.

The square root of 15967972 is about 3995.9944944907. The cubic root of 15967972 is about 251.8159612009.

The spelling of 15967972 in words is "fifteen million, nine hundred sixty-seven thousand, nine hundred seventy-two".