39999872 has 32 divisors (see below), whose sum is σ = 86934600. Its totient is φ = 18181120.

The previous prime is 39999863. The next prime is 39999899. The reversal of 39999872 is 27899993.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12797 + ... + 15612.

Almost surely, 2^39999872 is an apocalyptic number.

39999872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

39999872 is an abundant number, since it is smaller than the sum of its proper divisors (46934728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39999872 is a wasteful number, since it uses less digits than its factorization.

39999872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28434 (or 28422 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 56.

The square root of 39999872 is about 6324.5452010402. The cubic root of 39999872 is about 341.9948245401.

The spelling of 39999872 in words is "thirty-nine million, nine hundred ninety-nine thousand, eight hundred seventy-two".