138440746 has 16 divisors (see below), whose sum is σ = 211203720. Its totient is φ = 68048640.

The previous prime is 138440737. The next prime is 138440767. The reversal of 138440746 is 647044831.

It can be written as a sum of positive squares in 4 ways, for example, as 56085121 + 82355625 = 7489^2 + 9075^2 .

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, 30070 + ... + 34366.

Almost surely, 2^138440746 is an apocalyptic number.

138440746 is a deficient number, since it is larger than the sum of its proper divisors (72762974).

138440746 is a wasteful number, since it uses less digits than its factorization.

138440746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 138440746 is about 11766.0845653939. The cubic root of 138440746 is about 517.3144905182.

The spelling of 138440746 in words is "one hundred thirty-eight million, four hundred forty thousand, seven hundred forty-six".