138635946 has 12 divisors (see below), whose sum is σ = 300377922. Its totient is φ = 46211976.

The previous prime is 138635911. The next prime is 138635957. The reversal of 138635946 is 649536831.

138635946 is a `hidden beast` number, since 1 + 3 + 8 + 635 + 9 + 4 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 106316721 + 32319225 = 10311^2 + 5685^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3850981 + ... + 3851016.

Almost surely, 2^138635946 is an apocalyptic number.

138635946 is an abundant number, since it is smaller than the sum of its proper divisors (161741976).

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

138635946 is a wasteful number, since it uses less digits than its factorization.

138635946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7702005 (or 7702002 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 138635946 is about 11774.3766713996. The cubic root of 138635946 is about 517.5575123367.

The spelling of 138635946 in words is "one hundred thirty-eight million, six hundred thirty-five thousand, nine hundred forty-six".