15801972 has 12 divisors (see below), whose sum is σ = 36871296. Its totient is φ = 5267320.

The previous prime is 15801967. The next prime is 15801983. The reversal of 15801972 is 27910851.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 658404 + ... + 658427.

It is an arithmetic number, because the mean of its divisors is an integer number (3072608).

Almost surely, 2^15801972 is an apocalyptic number.

15801972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15801972 is an abundant number, since it is smaller than the sum of its proper divisors (21069324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15801972 is a wasteful number, since it uses less digits than its factorization.

15801972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316838 (or 1316836 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 15801972 is about 3975.1694303514. The cubic root of 15801972 is about 250.9403095047.

The spelling of 15801972 in words is "fifteen million, eight hundred one thousand, nine hundred seventy-two".