138879413 has 2 divisors, whose sum is σ = 138879414. Its totient is φ = 138879412.

The previous prime is 138879353. The next prime is 138879449. The reversal of 138879413 is 314978831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138250564 + 628849 = 11758^2 + 793^2 .

It is a cyclic number.

It is not a de Polignac number, because 138879413 - 2⁸ = 138879157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138875413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69439706 + 69439707.

It is an arithmetic number, because the mean of its divisors is an integer number (69439707).

Almost surely, 2^138879413 is an apocalyptic number.

It is an amenable number.

138879413 is a deficient number, since it is larger than the sum of its proper divisors (1).

138879413 is an equidigital number, since it uses as much as digits as its factorization.

138879413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 138879413 is about 11784.7109850009. The cubic root of 138879413 is about 517.8603065418.

The spelling of 138879413 in words is "one hundred thirty-eight million, eight hundred seventy-nine thousand, four hundred thirteen".