138837806 has 8 divisors (see below), whose sum is σ = 208566360. Its totient is φ = 69315688.

The previous prime is 138837799. The next prime is 138837817. The reversal of 138837806 is 608738831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 49916 + ... + 52623.

It is an arithmetic number, because the mean of its divisors is an integer number (26070795).

Almost surely, 2^138837806 is an apocalyptic number.

138837806 is a deficient number, since it is larger than the sum of its proper divisors (69728554).

138837806 is a wasteful number, since it uses less digits than its factorization.

138837806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103218.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 138837806 is about 11782.9455570328. The cubic root of 138837806 is about 517.8085859750.

The spelling of 138837806 in words is "one hundred thirty-eight million, eight hundred thirty-seven thousand, eight hundred six".