138967973 has 2 divisors, whose sum is σ = 138967974. Its totient is φ = 138967972.

The previous prime is 138967897. The next prime is 138967991. The reversal of 138967973 is 379769831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138250564 + 717409 = 11758^2 + 847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138967973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138967993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69483986 + 69483987.

It is an arithmetic number, because the mean of its divisors is an integer number (69483987).

Almost surely, 2^138967973 is an apocalyptic number.

It is an amenable number.

138967973 is a deficient number, since it is larger than the sum of its proper divisors (1).

138967973 is an equidigital number, since it uses as much as digits as its factorization.

138967973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 53.

The square root of 138967973 is about 11788.4677969616. The cubic root of 138967973 is about 517.9703587636.

The spelling of 138967973 in words is "one hundred thirty-eight million, nine hundred sixty-seven thousand, nine hundred seventy-three".