138649023 has 16 divisors (see below), whose sum is σ = 216217600. Its totient is φ = 87567480.

The previous prime is 138649009. The next prime is 138649033. The reversal of 138649023 is 320946831.

138649023 is a `hidden beast` number, since 1 + 3 + 8 + 649 + 0 + 2 + 3 = 666.

It is not a de Polignac number, because 138649023 - 2⁸ = 138648767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138649033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134623 + ... + 135648.

It is an arithmetic number, because the mean of its divisors is an integer number (13513600).

Almost surely, 2^138649023 is an apocalyptic number.

138649023 is a deficient number, since it is larger than the sum of its proper divisors (77568577).

138649023 is a wasteful number, since it uses less digits than its factorization.

138649023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270299 (or 270293 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 138649023 is about 11774.9319743258. The cubic root of 138649023 is about 517.5737849004.

The spelling of 138649023 in words is "one hundred thirty-eight million, six hundred forty-nine thousand, twenty-three".