138693808 has 20 divisors (see below), whose sum is σ = 293148648. Its totient is φ = 63042560.

The previous prime is 138693781. The next prime is 138693817. The reversal of 138693808 is 808396831.

138693808 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 393841 + ... + 394192.

Almost surely, 2^138693808 is an apocalyptic number.

It is an amenable number.

138693808 is an abundant number, since it is smaller than the sum of its proper divisors (154454840).

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

138693808 is a wasteful number, since it uses less digits than its factorization.

138693808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788052 (or 788046 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 138693808 is about 11776.8335302831. The cubic root of 138693808 is about 517.6295060447.

The spelling of 138693808 in words is "one hundred thirty-eight million, six hundred ninety-three thousand, eight hundred eight".