138323975 has 12 divisors (see below), whose sum is σ = 173939760. Its totient is φ = 109099200.

The previous prime is 138323959. The next prime is 138323981. The reversal of 138323975 is 579323831.

It is not a de Polignac number, because 138323975 - 2⁴ = 138323959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37190 + ... + 40739.

It is an arithmetic number, because the mean of its divisors is an integer number (14494980).

Almost surely, 2^138323975 is an apocalyptic number.

138323975 is a deficient number, since it is larger than the sum of its proper divisors (35615785).

138323975 is an equidigital number, since it uses as much as digits as its factorization.

138323975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78010 (or 78005 counting only the distinct ones).

The product of its digits is 136080, while the sum is 41.

The square root of 138323975 is about 11761.1213325941. The cubic root of 138323975 is about 517.1690027095.

The spelling of 138323975 in words is "one hundred thirty-eight million, three hundred twenty-three thousand, nine hundred seventy-five".