39999816 has 48 divisors (see below), whose sum is σ = 112074300. Its totient is φ = 12872832.

The previous prime is 39999811. The next prime is 39999821. The reversal of 39999816 is 61899993.

It is an interprime number because it is at equal distance from previous prime (39999811) and next prime (39999821).

It can be written as a sum of positive squares in 2 ways, for example, as 36650916 + 3348900 = 6054^2 + 1830^2 .

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (39999811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7491 + ... + 11666.

Almost surely, 2^39999816 is an apocalyptic number.

39999816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

39999816 is an abundant number, since it is smaller than the sum of its proper divisors (72074484).

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

39999816 is a wasteful number, since it uses less digits than its factorization.

39999816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19198 (or 19191 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 39999816 is about 6324.5407738428. The cubic root of 39999816 is about 341.9946649419.

The spelling of 39999816 in words is "thirty-nine million, nine hundred ninety-nine thousand, eight hundred sixteen".