138772899 has 8 divisors (see below), whose sum is σ = 205589520. Its totient is φ = 92515248.

The previous prime is 138772891. The next prime is 138772913. The reversal of 138772899 is 998277831.

It is not a de Polignac number, because 138772899 - 2³ = 138772891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138772891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2569842 + ... + 2569895.

It is an arithmetic number, because the mean of its divisors is an integer number (25698690).

Almost surely, 2^138772899 is an apocalyptic number.

138772899 is a deficient number, since it is larger than the sum of its proper divisors (66816621).

138772899 is an equidigital number, since it uses as much as digits as its factorization.

138772899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5139746 (or 5139740 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 138772899 is about 11780.1909577052. The cubic root of 138772899 is about 517.7278811543.

The spelling of 138772899 in words is "one hundred thirty-eight million, seven hundred seventy-two thousand, eight hundred ninety-nine".