38640812 has 18 divisors (see below), whose sum is σ = 78662052. Its totient is φ = 16560264.

The previous prime is 38640799. The next prime is 38640821. The reversal of 38640812 is 21804683.

38640812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×38640812² = 2986224704038688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 98378 + ... + 98769.

It is an arithmetic number, because the mean of its divisors is an integer number (4370114).

Almost surely, 2^38640812 is an apocalyptic number.

It is an amenable number.

38640812 is an abundant number, since it is smaller than the sum of its proper divisors (40021240).

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

38640812 is a wasteful number, since it uses less digits than its factorization.

38640812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197165 (or 197156 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 38640812 is about 6216.1734210043. The cubic root of 38640812 is about 338.0768355835.

The spelling of 38640812 in words is "thirty-eight million, six hundred forty thousand, eight hundred twelve".