138616908 has 12 divisors (see below), whose sum is σ = 323439480. Its totient is φ = 46205632.

The previous prime is 138616879. The next prime is 138616939. The reversal of 138616908 is 809616831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 138616908.

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, 5775693 + ... + 5775716.

It is an arithmetic number, because the mean of its divisors is an integer number (26953290).

Almost surely, 2^138616908 is an apocalyptic number.

It is an amenable number.

138616908 is an abundant number, since it is smaller than the sum of its proper divisors (184822572).

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

138616908 is a wasteful number, since it uses less digits than its factorization.

138616908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11551416 (or 11551414 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 138616908 is about 11773.5681932029. The cubic root of 138616908 is about 517.5338202826.

The spelling of 138616908 in words is "one hundred thirty-eight million, six hundred sixteen thousand, nine hundred eight".