39961644 has 24 divisors (see below), whose sum is σ = 94825920. Its totient is φ = 13094544.

The previous prime is 39961639. The next prime is 39961661. The reversal of 39961644 is 44616993.

It is a junction number, because it is equal to n+sod(n) for n = 39961596 and 39961605.

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, 27514 + ... + 28929.

It is an arithmetic number, because the mean of its divisors is an integer number (3951080).

Almost surely, 2^39961644 is an apocalyptic number.

It is an amenable number.

39961644 is an abundant number, since it is smaller than the sum of its proper divisors (54864276).

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

39961644 is a wasteful number, since it uses less digits than its factorization.

39961644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56509 (or 56507 counting only the distinct ones).

The product of its digits is 139968, while the sum is 42.

The square root of 39961644 is about 6321.5222850196. The cubic root of 39961644 is about 341.8858413143.

The spelling of 39961644 in words is "thirty-nine million, nine hundred sixty-one thousand, six hundred forty-four".