138633388 has 6 divisors (see below), whose sum is σ = 242608436. Its totient is φ = 69316692.

The previous prime is 138633379. The next prime is 138633389. The reversal of 138633388 is 883336831.

It is not an unprimeable number, because it can be changed into a prime (138633389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17329170 + ... + 17329177.

Almost surely, 2^138633388 is an apocalyptic number.

It is an amenable number.

138633388 is a deficient number, since it is larger than the sum of its proper divisors (103975048).

138633388 is a wasteful number, since it uses less digits than its factorization.

138633388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34658351 (or 34658349 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The square root of 138633388 is about 11774.2680451907. The cubic root of 138633388 is about 517.5543291308.

The spelling of 138633388 in words is "one hundred thirty-eight million, six hundred thirty-three thousand, three hundred eighty-eight".