138969967 has 2 divisors, whose sum is σ = 138969968. Its totient is φ = 138969966.

The previous prime is 138969959. The next prime is 138970021. The reversal of 138969967 is 769969831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138969967 - 2³ = 138969959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138961967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69484983 + 69484984.

It is an arithmetic number, because the mean of its divisors is an integer number (69484984).

Almost surely, 2^138969967 is an apocalyptic number.

138969967 is a deficient number, since it is larger than the sum of its proper divisors (1).

138969967 is an equidigital number, since it uses as much as digits as its factorization.

138969967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 58.

The square root of 138969967 is about 11788.5523708384. The cubic root of 138969967 is about 517.9728361401.

The spelling of 138969967 in words is "one hundred thirty-eight million, nine hundred sixty-nine thousand, nine hundred sixty-seven".