138904790 has 16 divisors (see below), whose sum is σ = 264736512. Its totient is φ = 52293504.

The previous prime is 138904789. The next prime is 138904793. The reversal of 138904790 is 97409831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138904793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408374 + ... + 408713.

It is an arithmetic number, because the mean of its divisors is an integer number (16546032).

Almost surely, 2^138904790 is an apocalyptic number.

138904790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138904790 is a deficient number, since it is larger than the sum of its proper divisors (125831722).

138904790 is a wasteful number, since it uses less digits than its factorization.

138904790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817111.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 138904790 is about 11785.7876274774. The cubic root of 138904790 is about 517.8918469512.

The spelling of 138904790 in words is "one hundred thirty-eight million, nine hundred four thousand, seven hundred ninety".