138923008 has 44 divisors (see below), whose sum is σ = 317399632. Its totient is φ = 59535360.

The previous prime is 138922999. The next prime is 138923009. The reversal of 138923008 is 800329831.

It is not an unprimeable number, because it can be changed into a prime (138923009) 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, 2523 + ... + 16858.

It is an arithmetic number, because the mean of its divisors is an integer number (7213628).

Almost surely, 2^138923008 is an apocalyptic number.

It is an amenable number.

138923008 is an abundant number, since it is smaller than the sum of its proper divisors (178476624).

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

138923008 is an equidigital number, since it uses as much as digits as its factorization.

138923008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19408 (or 19390 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 138923008 is about 11786.5604821763. The cubic root of 138923008 is about 517.9144872581.

It can be divided in two parts, 13892 and 3008, that added together give a square (16900 = 130²).

The spelling of 138923008 in words is "one hundred thirty-eight million, nine hundred twenty-three thousand, eight".