138693206 has 16 divisors (see below), whose sum is σ = 209704464. Its totient is φ = 68794464.

The previous prime is 138693173. The next prime is 138693221. The reversal of 138693206 is 602396831.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138693206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179036 + ... + 179808.

It is an arithmetic number, because the mean of its divisors is an integer number (13106529).

Almost surely, 2^138693206 is an apocalyptic number.

138693206 is a deficient number, since it is larger than the sum of its proper divisors (71011258).

138693206 is a wasteful number, since it uses less digits than its factorization.

138693206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 138693206 is about 11776.8079716025. The cubic root of 138693206 is about 517.6287571206.

The spelling of 138693206 in words is "one hundred thirty-eight million, six hundred ninety-three thousand, two hundred six".