138939216 has 40 divisors (see below), whose sum is σ = 386537760. Its totient is φ = 42750336.

The previous prime is 138939197. The next prime is 138939233. The reversal of 138939216 is 612939831.

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, 110706 + ... + 111953.

It is an arithmetic number, because the mean of its divisors is an integer number (9663444).

Almost surely, 2^138939216 is an apocalyptic number.

138939216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138939216 is an abundant number, since it is smaller than the sum of its proper divisors (247598544).

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

138939216 is a wasteful number, since it uses less digits than its factorization.

138939216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222683 (or 222677 counting only the distinct ones).

The product of its digits is 69984, while the sum is 42.

The square root of 138939216 is about 11787.2480248784. The cubic root of 138939216 is about 517.9346279861.

The spelling of 138939216 in words is "one hundred thirty-eight million, nine hundred thirty-nine thousand, two hundred sixteen".