138574873 has 2 divisors, whose sum is σ = 138574874. Its totient is φ = 138574872.

The previous prime is 138574729. The next prime is 138574897. The reversal of 138574873 is 378475831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105431824 + 33143049 = 10268^2 + 5757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138574873 is a prime.

It is a super-2 number, since 2×138574873² = 38405990853932258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138574573) 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, 69287436 + 69287437.

It is an arithmetic number, because the mean of its divisors is an integer number (69287437).

Almost surely, 2^138574873 is an apocalyptic number.

It is an amenable number.

138574873 is a deficient number, since it is larger than the sum of its proper divisors (1).

138574873 is an equidigital number, since it uses as much as digits as its factorization.

138574873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 46.

The square root of 138574873 is about 11771.7829150898. The cubic root of 138574873 is about 517.4815016687.

The spelling of 138574873 in words is "one hundred thirty-eight million, five hundred seventy-four thousand, eight hundred seventy-three".