138616988 has 24 divisors (see below), whose sum is σ = 245787360. Its totient is φ = 68397120.

The previous prime is 138616979. The next prime is 138616991. The reversal of 138616988 is 889616831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209378 + ... + 210038.

It is an arithmetic number, because the mean of its divisors is an integer number (10241140).

Almost surely, 2^138616988 is an apocalyptic number.

It is an amenable number.

138616988 is a deficient number, since it is larger than the sum of its proper divisors (107170372).

138616988 is a wasteful number, since it uses less digits than its factorization.

138616988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1275 counting only the distinct ones).

The product of its digits is 497664, while the sum is 50.

The square root of 138616988 is about 11773.5715906432. The cubic root of 138616988 is about 517.5339198441.

The spelling of 138616988 in words is "one hundred thirty-eight million, six hundred sixteen thousand, nine hundred eighty-eight".