138888764 has 12 divisors (see below), whose sum is σ = 277777584. Its totient is φ = 59523744.

The previous prime is 138888707. The next prime is 138888767. The reversal of 138888764 is 467888831.

It is a happy number.

138888764 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138888767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2480129 + ... + 2480184.

It is an arithmetic number, because the mean of its divisors is an integer number (23148132).

Almost surely, 2^138888764 is an apocalyptic number.

138888764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138888764 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138888764 is a wasteful number, since it uses less digits than its factorization.

138888764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4960324 (or 4960322 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 53.

The square root of 138888764 is about 11785.1077211878. The cubic root of 138888764 is about 517.8719291021.

The spelling of 138888764 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, seven hundred sixty-four".