138309708 has 24 divisors (see below), whose sum is σ = 327541312. Its totient is φ = 45414864.

The previous prime is 138309707. The next prime is 138309713. The reversal of 138309708 is 807903831.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (138309707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85210 + ... + 86817.

Almost surely, 2^138309708 is an apocalyptic number.

It is an amenable number.

138309708 is an abundant number, since it is smaller than the sum of its proper divisors (189231604).

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

138309708 is a wasteful number, since it uses less digits than its factorization.

138309708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172101 (or 172099 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 138309708 is about 11760.5147846512. The cubic root of 138309708 is about 517.1512214973.

The spelling of 138309708 in words is "one hundred thirty-eight million, three hundred nine thousand, seven hundred eight".