138836608 has 16 divisors (see below), whose sum is σ = 276588810. Its totient is φ = 69418240.

The previous prime is 138836597. The next prime is 138836609. The reversal of 138836608 is 806638831.

It can be written as a sum of positive squares in only one way, i.e., 127057984 + 11778624 = 11272^2 + 3432^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (138836609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542203 + ... + 542458.

Almost surely, 2^138836608 is an apocalyptic number.

It is an amenable number.

138836608 is a deficient number, since it is larger than the sum of its proper divisors (137752202).

138836608 is an equidigital number, since it uses as much as digits as its factorization.

138836608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084675 (or 1084663 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 138836608 is about 11782.8947207382. The cubic root of 138836608 is about 517.8070966197.

The spelling of 138836608 in words is "one hundred thirty-eight million, eight hundred thirty-six thousand, six hundred eight".