39891856 has 15 divisors (see below), whose sum is σ = 77339451. Its totient is φ = 19933296.

The previous prime is 39891853. The next prime is 39891889. The reversal of 39891856 is 65819893.

The square root of 39891856 is 6316.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39891851) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 24475 + ... + 26053.

Almost surely, 2^39891856 is an apocalyptic number.

39891856 is the 6316-th square number.

It is an amenable number.

39891856 is a deficient number, since it is larger than the sum of its proper divisors (37447595).

39891856 is an frugal number, since it uses more digits than its factorization.

39891856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166 (or 1581 counting only the distinct ones).

The product of its digits is 466560, while the sum is 49.

The cubic root of 39891856 is about 341.6867050975.

Multiplying 39891856 by its sum of digits (49), we get a square (1954700944 = 44212²).

The spelling of 39891856 in words is "thirty-nine million, eight hundred ninety-one thousand, eight hundred fifty-six".