138756330 has 48 divisors (see below), whose sum is σ = 366166944. Its totient is φ = 36447840.

The previous prime is 138756323. The next prime is 138756349. The reversal of 138756330 is 33657831.

138756330 is a `hidden beast` number, since 13 + 8 + 7 + 5 + 633 + 0 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5476 + ... + 17535.

It is an arithmetic number, because the mean of its divisors is an integer number (7628478).

Almost surely, 2^138756330 is an apocalyptic number.

138756330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138756330 is an abundant number, since it is smaller than the sum of its proper divisors (227410614).

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

138756330 is a wasteful number, since it uses less digits than its factorization.

138756330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23091 (or 23088 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 138756330 is about 11779.4876798611. The cubic root of 138756330 is about 517.7072753666.

The spelling of 138756330 in words is "one hundred thirty-eight million, seven hundred fifty-six thousand, three hundred thirty".