138923630 has 48 divisors (see below), whose sum is σ = 273222720. Its totient is φ = 50791104.

The previous prime is 138923623. The next prime is 138923639. The reversal of 138923630 is 36329831.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138923639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104027 + ... + 105353.

It is an arithmetic number, because the mean of its divisors is an integer number (5692140).

Almost surely, 2^138923630 is an apocalyptic number.

138923630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138923630 is a deficient number, since it is larger than the sum of its proper divisors (134299090).

138923630 is a wasteful number, since it uses less digits than its factorization.

138923630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401 (or 1382 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 138923630 is about 11786.5868681311. The cubic root of 138923630 is about 517.9152602098.

The spelling of 138923630 in words is "one hundred thirty-eight million, nine hundred twenty-three thousand, six hundred thirty".