138394808 has 16 divisors (see below), whose sum is σ = 260480880. Its totient is φ = 68933248.

The previous prime is 138394801. The next prime is 138394813. The reversal of 138394808 is 808493831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138394801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30785 + ... + 34992.

It is an arithmetic number, because the mean of its divisors is an integer number (16280055).

Almost surely, 2^138394808 is an apocalyptic number.

It is an amenable number.

138394808 is a deficient number, since it is larger than the sum of its proper divisors (122086072).

138394808 is a wasteful number, since it uses less digits than its factorization.

138394808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66046 (or 66042 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 138394808 is about 11764.1322671925. The cubic root of 138394808 is about 517.2572650197.

The spelling of 138394808 in words is "one hundred thirty-eight million, three hundred ninety-four thousand, eight hundred eight".