138904967 has 2 divisors, whose sum is σ = 138904968. Its totient is φ = 138904966.

The previous prime is 138904957. The next prime is 138904999. The reversal of 138904967 is 769409831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138904967 - 2⁴ = 138904951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138904907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69452483 + 69452484.

It is an arithmetic number, because the mean of its divisors is an integer number (69452484).

Almost surely, 2^138904967 is an apocalyptic number.

138904967 is a deficient number, since it is larger than the sum of its proper divisors (1).

138904967 is an equidigital number, since it uses as much as digits as its factorization.

138904967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 138904967 is about 11785.7951365192. The cubic root of 138904967 is about 517.8920669264.

The spelling of 138904967 in words is "one hundred thirty-eight million, nine hundred four thousand, nine hundred sixty-seven".