138973194 has 24 divisors (see below), whose sum is σ = 303135300. Its totient is φ = 46012608.

The previous prime is 138973187. The next prime is 138973213. The reversal of 138973194 is 491379831.

It can be written as a sum of positive squares in 2 ways, for example, as 127983969 + 10989225 = 11313^2 + 3315^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23227 + ... + 28590.

Almost surely, 2^138973194 is an apocalyptic number.

138973194 is an abundant number, since it is smaller than the sum of its proper divisors (164162106).

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

138973194 is a wasteful number, since it uses less digits than its factorization.

138973194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51974 (or 51971 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 138973194 is about 11788.6892401149. The cubic root of 138973194 is about 517.9768453646.

The spelling of 138973194 in words is "one hundred thirty-eight million, nine hundred seventy-three thousand, one hundred ninety-four".