138906292 has 24 divisors (see below), whose sum is σ = 289892736. Its totient is φ = 56942688.

The previous prime is 138906281. The next prime is 138906323. The reversal of 138906292 is 292609831.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 107203 + ... + 108490.

It is an arithmetic number, because the mean of its divisors is an integer number (12078864).

Almost surely, 2^138906292 is an apocalyptic number.

It is an amenable number.

138906292 is an abundant number, since it is smaller than the sum of its proper divisors (150986444).

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

138906292 is a wasteful number, since it uses less digits than its factorization.

138906292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215727 (or 215725 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 138906292 is about 11785.8513481208. The cubic root of 138906292 is about 517.8937136273.

The spelling of 138906292 in words is "one hundred thirty-eight million, nine hundred six thousand, two hundred ninety-two".