39972429 has 12 divisors (see below), whose sum is σ = 65986336. Its totient is φ = 22841352.

The previous prime is 39972421. The next prime is 39972431. The reversal of 39972429 is 92427993.

It is not a de Polignac number, because 39972429 - 2³ = 39972421 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 (39972421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317179 + ... + 317304.

Almost surely, 2^39972429 is an apocalyptic number.

It is an amenable number.

39972429 is a deficient number, since it is larger than the sum of its proper divisors (26013907).

39972429 is a wasteful number, since it uses less digits than its factorization.

39972429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634496 (or 634493 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 39972429 is about 6322.3752656735. The cubic root of 39972429 is about 341.9165950302.

It can be divided in two parts, 39972 and 429, that added together give a square (40401 = 201²).

The spelling of 39972429 in words is "thirty-nine million, nine hundred seventy-two thousand, four hundred twenty-nine".