15972172 has 6 divisors (see below), whose sum is σ = 27951308. Its totient is φ = 7986084.

The previous prime is 15972157. The next prime is 15972193. The reversal of 15972172 is 27127951.

It is a super-2 number, since 2×15972172² = 510220556795168, 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, 1996518 + ... + 1996525.

Almost surely, 2^15972172 is an apocalyptic number.

It is an amenable number.

15972172 is a deficient number, since it is larger than the sum of its proper divisors (11979136).

15972172 is a wasteful number, since it uses less digits than its factorization.

15972172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993047 (or 3993045 counting only the distinct ones).

The product of its digits is 8820, while the sum is 34.

The square root of 15972172 is about 3996.5199861880. The cubic root of 15972172 is about 251.8380373569.

The spelling of 15972172 in words is "fifteen million, nine hundred seventy-two thousand, one hundred seventy-two".