138416279 has 2 divisors, whose sum is σ = 138416280. Its totient is φ = 138416278.

The previous prime is 138416263. The next prime is 138416293. The reversal of 138416279 is 972614831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138416279 - 2⁴ = 138416263 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138416879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69208139 + 69208140.

It is an arithmetic number, because the mean of its divisors is an integer number (69208140).

Almost surely, 2^138416279 is an apocalyptic number.

138416279 is a deficient number, since it is larger than the sum of its proper divisors (1).

138416279 is an equidigital number, since it uses as much as digits as its factorization.

138416279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 138416279 is about 11765.0447937949. The cubic root of 138416279 is about 517.2840132690.

The spelling of 138416279 in words is "one hundred thirty-eight million, four hundred sixteen thousand, two hundred seventy-nine".