138608 has 10 divisors (see below), whose sum is σ = 268584. Its totient is φ = 69296.

The previous prime is 138599. The next prime is 138617. The reversal of 138608 is 806831.

It is an interprime number because it is at equal distance from previous prime (138599) and next prime (138617).

It is a congruent number.

It is an unprimeable number.

138608 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4316 + ... + 4347.

2¹³⁸⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

138608 is a deficient number, since it is larger than the sum of its proper divisors (129976).

138608 is an equidigital number, since it uses as much as digits as its factorization.

138608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8671 (or 8665 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 138608 is about 372.3009535309. The cubic root of 138608 is about 51.7522733876.

The spelling of 138608 in words is "one hundred thirty-eight thousand, six hundred eight".