138800639 has 2 divisors, whose sum is σ = 138800640. Its totient is φ = 138800638.

The previous prime is 138800633. The next prime is 138800647. The reversal of 138800639 is 936008831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138800639 - 2²⁴ = 122023423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138800633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69400319 + 69400320.

It is an arithmetic number, because the mean of its divisors is an integer number (69400320).

Almost surely, 2^138800639 is an apocalyptic number.

138800639 is a deficient number, since it is larger than the sum of its proper divisors (1).

138800639 is an equidigital number, since it uses as much as digits as its factorization.

138800639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 138800639 is about 11781.3682991408. The cubic root of 138800639 is about 517.7623759168.

The spelling of 138800639 in words is "one hundred thirty-eight million, eight hundred thousand, six hundred thirty-nine".