39972430 has 16 divisors (see below), whose sum is σ = 72271440. Its totient is φ = 15917632.

The previous prime is 39972421. The next prime is 39972431. The reversal of 39972430 is 3427993.

It is a self number, because there is not a number n which added to its sum of digits gives 39972430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39972431) 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, 6535 + ... + 11074.

It is an arithmetic number, because the mean of its divisors is an integer number (4516965).

Almost surely, 2^39972430 is an apocalyptic number.

39972430 is a deficient number, since it is larger than the sum of its proper divisors (32299010).

39972430 is a wasteful number, since it uses less digits than its factorization.

39972430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17843.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 39972430 is about 6322.3753447577. The cubic root of 39972430 is about 341.9165978814.

The spelling of 39972430 in words is "thirty-nine million, nine hundred seventy-two thousand, four hundred thirty".