138977188 has 12 divisors (see below), whose sum is σ = 277954432. Its totient is φ = 59561640.

The previous prime is 138977173. The next prime is 138977197. The reversal of 138977188 is 881779831.

138977188 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

138977188 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2481708 + ... + 2481763.

Almost surely, 2^138977188 is an apocalyptic number.

It is an amenable number.

138977188 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.

138977188 is a wasteful number, since it uses less digits than its factorization.

138977188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4963482 (or 4963480 counting only the distinct ones).

The product of its digits is 677376, while the sum is 52.

The square root of 138977188 is about 11788.8586385621. The cubic root of 138977188 is about 517.9818074240.

The spelling of 138977188 in words is "one hundred thirty-eight million, nine hundred seventy-seven thousand, one hundred eighty-eight".