138291323 has 2 divisors, whose sum is σ = 138291324. Its totient is φ = 138291322.

The previous prime is 138291313. The next prime is 138291371. The reversal of 138291323 is 323192831.

138291323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138291323 - 2²⁰ = 137242747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138291323.

It is not a weakly prime, because it can be changed into another prime (138291313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69145661 + 69145662.

It is an arithmetic number, because the mean of its divisors is an integer number (69145662).

Almost surely, 2^138291323 is an apocalyptic number.

138291323 is a deficient number, since it is larger than the sum of its proper divisors (1).

138291323 is an equidigital number, since it uses as much as digits as its factorization.

138291323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 138291323 is about 11759.7331177200. The cubic root of 138291323 is about 517.1283061463.

The spelling of 138291323 in words is "one hundred thirty-eight million, two hundred ninety-one thousand, three hundred twenty-three".