39901972 has 24 divisors (see below), whose sum is σ = 76501152. Its totient is φ = 18060000.

The previous prime is 39901963. The next prime is 39901997. The reversal of 39901972 is 27910993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9238 + ... + 12850.

It is an arithmetic number, because the mean of its divisors is an integer number (3187548).

Almost surely, 2^39901972 is an apocalyptic number.

It is an amenable number.

39901972 is a deficient number, since it is larger than the sum of its proper divisors (36599180).

39901972 is a wasteful number, since it uses less digits than its factorization.

39901972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879 (or 3877 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 39901972 is about 6316.8007725430. The cubic root of 39901972 is about 341.7155849318.

The spelling of 39901972 in words is "thirty-nine million, nine hundred one thousand, nine hundred seventy-two".