138756375 has 32 divisors (see below), whose sum is σ = 256551360. Its totient is φ = 74001600.

The previous prime is 138756353. The next prime is 138756407. The reversal of 138756375 is 573657831.

138756375 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 5 + 637 + 5 = 666.

It is not a de Polignac number, because 138756375 - 2⁸ = 138756119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 138756375.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17182 + ... + 23931.

It is an arithmetic number, because the mean of its divisors is an integer number (8017230).

Almost surely, 2^138756375 is an apocalyptic number.

138756375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138756375 is a deficient number, since it is larger than the sum of its proper divisors (117794985).

138756375 is an equidigital number, since it uses as much as digits as its factorization.

138756375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41137 (or 41121 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 138756375 is about 11779.4895899610. The cubic root of 138756375 is about 517.7073313324.

The spelling of 138756375 in words is "one hundred thirty-eight million, seven hundred fifty-six thousand, three hundred seventy-five".