39968840 has 16 divisors (see below), whose sum is σ = 89929980. Its totient is φ = 15987520.

The previous prime is 39968839. The next prime is 39968849. The reversal of 39968840 is 4886993.

It can be written as a sum of positive squares in 2 ways, for example, as 39967684 + 1156 = 6322^2 + 34^2 .

It is not an unprimeable number, because it can be changed into a prime (39968849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499571 + ... + 499650.

Almost surely, 2^39968840 is an apocalyptic number.

It is an amenable number.

39968840 is an abundant number, since it is smaller than the sum of its proper divisors (49961140).

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

39968840 is a wasteful number, since it uses less digits than its factorization.

39968840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999232 (or 999228 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 39968840 is about 6322.0914261026. The cubic root of 39968840 is about 341.9063615149.

The spelling of 39968840 in words is "thirty-nine million, nine hundred sixty-eight thousand, eight hundred forty".