39997972 has 24 divisors (see below), whose sum is σ = 80587584. Its totient is φ = 17015232.

The previous prime is 39997939. The next prime is 39997973. The reversal of 39997972 is 27979993.

It is a super-2 number, since 2×39997972² = 3199675528225568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39997973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1378 + ... + 9049.

It is an arithmetic number, because the mean of its divisors is an integer number (3357816).

Almost surely, 2^39997972 is an apocalyptic number.

It is an amenable number.

39997972 is an abundant number, since it is smaller than the sum of its proper divisors (40589612).

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

39997972 is a wasteful number, since it uses less digits than its factorization.

39997972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10575 (or 10573 counting only the distinct ones).

The product of its digits is 1928934, while the sum is 55.

The square root of 39997972 is about 6324.3949908272. The cubic root of 39997972 is about 341.9894095190.

The spelling of 39997972 in words is "thirty-nine million, nine hundred ninety-seven thousand, nine hundred seventy-two".