138908794 has 8 divisors (see below), whose sum is σ = 208489428. Its totient is φ = 69412320.

The previous prime is 138908789. The next prime is 138908807. The reversal of 138908794 is 497809831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 134444025 + 4464769 = 11595^2 + 2113^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16737 + ... + 23620.

Almost surely, 2^138908794 is an apocalyptic number.

138908794 is a deficient number, since it is larger than the sum of its proper divisors (69580634).

138908794 is a wasteful number, since it uses less digits than its factorization.

138908794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42080.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 138908794 is about 11785.9574918629. The cubic root of 138908794 is about 517.8968230672.

The spelling of 138908794 in words is "one hundred thirty-eight million, nine hundred eight thousand, seven hundred ninety-four".