138368808 has 24 divisors (see below), whose sum is σ = 374749050. Its totient is φ = 46122912.

The previous prime is 138368803. The next prime is 138368819. The reversal of 138368808 is 808863831.

138368808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 92968164 + 45400644 = 9642^2 + 6738^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (138368803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 960823 + ... + 960966.

Almost surely, 2^138368808 is an apocalyptic number.

138368808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138368808 is an abundant number, since it is smaller than the sum of its proper divisors (236380242).

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

138368808 is a wasteful number, since it uses less digits than its factorization.

138368808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921801 (or 1921794 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 138368808 is about 11763.0271614070. The cubic root of 138368808 is about 517.2248709067.

The spelling of 138368808 in words is "one hundred thirty-eight million, three hundred sixty-eight thousand, eight hundred eight".