138127679 has 2 divisors, whose sum is σ = 138127680. Its totient is φ = 138127678.

The previous prime is 138127657. The next prime is 138127711. The reversal of 138127679 is 976721831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138127679 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 (138127079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69063839 + 69063840.

It is an arithmetic number, because the mean of its divisors is an integer number (69063840).

Almost surely, 2^138127679 is an apocalyptic number.

138127679 is a deficient number, since it is larger than the sum of its proper divisors (1).

138127679 is an equidigital number, since it uses as much as digits as its factorization.

138127679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 138127679 is about 11752.7732471957. The cubic root of 138127679 is about 516.9242481612.

The spelling of 138127679 in words is "one hundred thirty-eight million, one hundred twenty-seven thousand, six hundred seventy-nine".