138766079 has 2 divisors, whose sum is σ = 138766080. Its totient is φ = 138766078.

The previous prime is 138766051. The next prime is 138766097. The reversal of 138766079 is 970667831.

Together with next prime (138766097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138766079 is a 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 (138766009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69383039 + 69383040.

It is an arithmetic number, because the mean of its divisors is an integer number (69383040).

Almost surely, 2^138766079 is an apocalyptic number.

138766079 is a deficient number, since it is larger than the sum of its proper divisors (1).

138766079 is an equidigital number, since it uses as much as digits as its factorization.

138766079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 138766079 is about 11779.9014851568. The cubic root of 138766079 is about 517.7193997625.

The spelling of 138766079 in words is "one hundred thirty-eight million, seven hundred sixty-six thousand, seventy-nine".