138888767 has 2 divisors, whose sum is σ = 138888768. Its totient is φ = 138888766.

The previous prime is 138888707. The next prime is 138888791. The reversal of 138888767 is 767888831.

138888767 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138888767 - 2⁶ = 138888703 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 (138888707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69444383 + 69444384.

It is an arithmetic number, because the mean of its divisors is an integer number (69444384).

Almost surely, 2^138888767 is an apocalyptic number.

138888767 is a deficient number, since it is larger than the sum of its proper divisors (1).

138888767 is an equidigital number, since it uses as much as digits as its factorization.

138888767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3612672, while the sum is 56.

The square root of 138888767 is about 11785.1078484671. The cubic root of 138888767 is about 517.8719328308.

The spelling of 138888767 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, seven hundred sixty-seven".