138765888 has 42 divisors (see below), whose sum is σ = 397749014. Its totient is φ = 46255104.

The previous prime is 138765881. The next prime is 138765931. The reversal of 138765888 is 888567831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 107495424 + 31270464 = 10368^2 + 5592^2 .

It is not an unprimeable number, because it can be changed into a prime (138765881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119881 + ... + 121032.

Almost surely, 2^138765888 is an apocalyptic number.

138765888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138765888 is an abundant number, since it is smaller than the sum of its proper divisors (258983126).

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

138765888 is a wasteful number, since it uses less digits than its factorization.

138765888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240931 (or 240918 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The square root of 138765888 is about 11779.8933781253. The cubic root of 138765888 is about 517.7191622297.

The spelling of 138765888 in words is "one hundred thirty-eight million, seven hundred sixty-five thousand, eight hundred eighty-eight".