138694967 has 2 divisors, whose sum is σ = 138694968. Its totient is φ = 138694966.

The previous prime is 138694951. The next prime is 138694973. The reversal of 138694967 is 769496831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138694967 - 2⁴ = 138694951 is a prime.

It is a super-2 number, since 2×138694967² = 38472587742262178, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138694937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69347483 + 69347484.

It is an arithmetic number, because the mean of its divisors is an integer number (69347484).

Almost surely, 2^138694967 is an apocalyptic number.

138694967 is a deficient number, since it is larger than the sum of its proper divisors (1).

138694967 is an equidigital number, since it uses as much as digits as its factorization.

138694967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 53.

The square root of 138694967 is about 11776.8827369555. The cubic root of 138694967 is about 517.6309479042.

The spelling of 138694967 in words is "one hundred thirty-eight million, six hundred ninety-four thousand, nine hundred sixty-seven".