138626647 has 4 divisors (see below), whose sum is σ = 138653080. Its totient is φ = 138600216.

The previous prime is 138626629. The next prime is 138626651. The reversal of 138626647 is 746626831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138626647 - 2⁷ = 138626519 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 (138626627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2397 + ... + 16822.

It is an arithmetic number, because the mean of its divisors is an integer number (34663270).

Almost surely, 2^138626647 is an apocalyptic number.

138626647 is a deficient number, since it is larger than the sum of its proper divisors (26433).

138626647 is an equidigital number, since it uses as much as digits as its factorization.

138626647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26432.

The product of its digits is 290304, while the sum is 43.

The square root of 138626647 is about 11773.9817818782. The cubic root of 138626647 is about 517.5459403621.

The spelling of 138626647 in words is "one hundred thirty-eight million, six hundred twenty-six thousand, six hundred forty-seven".