138995473 has 2 divisors, whose sum is σ = 138995474. Its totient is φ = 138995472.

The previous prime is 138995459. The next prime is 138995477. The reversal of 138995473 is 374599831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97160449 + 41835024 = 9857^2 + 6468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138995473 is a prime.

It is not a weakly prime, because it can be changed into another prime (138995477) 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, 69497736 + 69497737.

It is an arithmetic number, because the mean of its divisors is an integer number (69497737).

Almost surely, 2^138995473 is an apocalyptic number.

It is an amenable number.

138995473 is a deficient number, since it is larger than the sum of its proper divisors (1).

138995473 is an equidigital number, since it uses as much as digits as its factorization.

138995473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 138995473 is about 11789.6341334242. The cubic root of 138995473 is about 518.0045230992.

The spelling of 138995473 in words is "one hundred thirty-eight million, nine hundred ninety-five thousand, four hundred seventy-three".