138408812 has 12 divisors (see below), whose sum is σ = 242682216. Its totient is φ = 69071040.

The previous prime is 138408763. The next prime is 138408821. The reversal of 138408812 is 218804831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30989 + ... + 35172.

It is an arithmetic number, because the mean of its divisors is an integer number (20223518).

Almost surely, 2^138408812 is an apocalyptic number.

It is an amenable number.

138408812 is a deficient number, since it is larger than the sum of its proper divisors (104273404).

138408812 is a wasteful number, since it uses less digits than its factorization.

138408812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66688 (or 66686 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 138408812 is about 11764.7274511567. The cubic root of 138408812 is about 517.2747113063.

The spelling of 138408812 in words is "one hundred thirty-eight million, four hundred eight thousand, eight hundred twelve".