138078667 has 2 divisors, whose sum is σ = 138078668. Its totient is φ = 138078666.

The previous prime is 138078613. The next prime is 138078751. The reversal of 138078667 is 766870831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138078667 - 2²⁷ = 3860939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138078067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69039333 + 69039334.

It is an arithmetic number, because the mean of its divisors is an integer number (69039334).

Almost surely, 2^138078667 is an apocalyptic number.

138078667 is a deficient number, since it is larger than the sum of its proper divisors (1).

138078667 is an equidigital number, since it uses as much as digits as its factorization.

138078667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 138078667 is about 11750.6879373082. The cubic root of 138078667 is about 516.8631006571.

The spelling of 138078667 in words is "one hundred thirty-eight million, seventy-eight thousand, six hundred sixty-seven".