39990256 has 40 divisors (see below), whose sum is σ = 82521504. Its totient is φ = 18708480.

The previous prime is 39990241. The next prime is 39990277. The reversal of 39990256 is 65209993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63061 + ... + 63691.

Almost surely, 2^39990256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39990256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41260752).

39990256 is an abundant number, since it is smaller than the sum of its proper divisors (42531248).

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

39990256 is a wasteful number, since it uses less digits than its factorization.

39990256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 39990256 is about 6323.7849425799. The cubic root of 39990256 is about 341.9674170707.

The spelling of 39990256 in words is "thirty-nine million, nine hundred ninety thousand, two hundred fifty-six".