15972428 has 6 divisors (see below), whose sum is σ = 27951756. Its totient is φ = 7986212.

The previous prime is 15972391. The next prime is 15972449. The reversal of 15972428 is 82427951.

It is a junction number, because it is equal to n+sod(n) for n = 15972391 and 15972400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996550 + ... + 1996557.

It is an arithmetic number, because the mean of its divisors is an integer number (4658626).

Almost surely, 2^15972428 is an apocalyptic number.

It is an amenable number.

15972428 is a deficient number, since it is larger than the sum of its proper divisors (11979328).

15972428 is a wasteful number, since it uses less digits than its factorization.

15972428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993111 (or 3993109 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 15972428 is about 3996.5520139240. The cubic root of 15972428 is about 251.8393828260.

The spelling of 15972428 in words is "fifteen million, nine hundred seventy-two thousand, four hundred twenty-eight".