39972491 has 8 divisors (see below), whose sum is σ = 45579744. Its totient is φ = 34727040.

The previous prime is 39972487. The next prime is 39972497. The reversal of 39972491 is 19427993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39972491 - 2² = 39972487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39972497) 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, 90215 + ... + 90656.

It is an arithmetic number, because the mean of its divisors is an integer number (5697468).

Almost surely, 2^39972491 is an apocalyptic number.

39972491 is a deficient number, since it is larger than the sum of its proper divisors (5607253).

39972491 is a wasteful number, since it uses less digits than its factorization.

39972491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180901.

The product of its digits is 122472, while the sum is 44.

The square root of 39972491 is about 6322.3801688921. The cubic root of 39972491 is about 341.9167718088.

The spelling of 39972491 in words is "thirty-nine million, nine hundred seventy-two thousand, four hundred ninety-one".