138736647 has 12 divisors (see below), whose sum is σ = 229025680. Its totient is φ = 79278048.

The previous prime is 138736639. The next prime is 138736649. The reversal of 138736647 is 746637831.

It is not a de Polignac number, because 138736647 - 2³ = 138736639 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 (138736649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1101022 + ... + 1101147.

Almost surely, 2^138736647 is an apocalyptic number.

138736647 is a deficient number, since it is larger than the sum of its proper divisors (90289033).

138736647 is a wasteful number, since it uses less digits than its factorization.

138736647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202182 (or 2202179 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 138736647 is about 11778.6521724686. The cubic root of 138736647 is about 517.6827947677.

The spelling of 138736647 in words is "one hundred thirty-eight million, seven hundred thirty-six thousand, six hundred forty-seven".