39890720 has 24 divisors (see below), whose sum is σ = 94242204. Its totient is φ = 15956224.

The previous prime is 39890693. The next prime is 39890737. The reversal of 39890720 is 2709893.

It can be written as a sum of positive squares in 2 ways, for example, as 39790864 + 99856 = 6308^2 + 316^2 .

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, 124499 + ... + 124818.

Almost surely, 2^39890720 is an apocalyptic number.

It is an amenable number.

39890720 is an abundant number, since it is smaller than the sum of its proper divisors (54351484).

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

39890720 is a wasteful number, since it uses less digits than its factorization.

39890720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249332 (or 249324 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 39890720 is about 6315.9100690241. The cubic root of 39890720 is about 341.6834616637.

The spelling of 39890720 in words is "thirty-nine million, eight hundred ninety thousand, seven hundred twenty".