39972499 has 24 divisors (see below), whose sum is σ = 48519680. Its totient is φ = 32235840.

The previous prime is 39972497. The next prime is 39972509. The reversal of 39972499 is 99427993.

It is not a de Polignac number, because 39972499 - 2¹ = 39972497 is a prime.

It is a Duffinian number.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 505942 + ... + 506020.

Almost surely, 2^39972499 is an apocalyptic number.

39972499 is a deficient number, since it is larger than the sum of its proper divisors (8547181).

39972499 is an equidigital number, since it uses as much as digits as its factorization.

39972499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 170 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 52.

The square root of 39972499 is about 6322.3808015652. The cubic root of 39972499 is about 341.9167946190.

The spelling of 39972499 in words is "thirty-nine million, nine hundred seventy-two thousand, four hundred ninety-nine".