138297279 has 8 divisors (see below), whose sum is σ = 186993792. Its totient is φ = 90899480.

The previous prime is 138297277. The next prime is 138297283. The reversal of 138297279 is 972792831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138297279 - 2¹ = 138297277 is a prime.

It is a super-2 number, since 2×138297279² = 38252274757607682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138297277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324429 + ... + 324854.

It is an arithmetic number, because the mean of its divisors is an integer number (23374224).

Almost surely, 2^138297279 is an apocalyptic number.

138297279 is a deficient number, since it is larger than the sum of its proper divisors (48696513).

138297279 is an equidigital number, since it uses as much as digits as its factorization.

138297279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649357.

The product of its digits is 381024, while the sum is 48.

The square root of 138297279 is about 11759.9863520329. The cubic root of 138297279 is about 517.1357300200.

The spelling of 138297279 in words is "one hundred thirty-eight million, two hundred ninety-seven thousand, two hundred seventy-nine".