39999956 has 12 divisors (see below), whose sum is σ = 70315392. Its totient is φ = 19909848.

The previous prime is 39999943. The next prime is 39999979. The reversal of 39999956 is 65999993.

It is a junction number, because it is equal to n+sod(n) for n = 39999895 and 39999904.

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, 21530 + ... + 23313.

It is an arithmetic number, because the mean of its divisors is an integer number (5859616).

Almost surely, 2^39999956 is an apocalyptic number.

It is an amenable number.

39999956 is a deficient number, since it is larger than the sum of its proper divisors (30315436).

39999956 is a wasteful number, since it uses less digits than its factorization.

39999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45070 (or 45068 counting only the distinct ones).

The product of its digits is 5314410, while the sum is 59.

The square root of 39999956 is about 6324.5518418304. The cubic root of 39999956 is about 341.9950639371.

The spelling of 39999956 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred fifty-six".