12539873 has 2 divisors, whose sum is σ = 12539874. Its totient is φ = 12539872.

The previous prime is 12539851. The next prime is 12539881. The reversal of 12539873 is 37893521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11175649 + 1364224 = 3343^2 + 1168^2 .

It is an emirp because it is prime and its reverse (37893521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12539873 is a prime.

It is a super-2 number, since 2×12539873² = 314496829712258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12539843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6269936 + 6269937.

It is an arithmetic number, because the mean of its divisors is an integer number (6269937).

Almost surely, 2^12539873 is an apocalyptic number.

It is an amenable number.

12539873 is a deficient number, since it is larger than the sum of its proper divisors (1).

12539873 is an equidigital number, since it uses as much as digits as its factorization.

12539873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 12539873 is about 3541.1683100355. The cubic root of 12539873 is about 232.3259451926.

The spelling of 12539873 in words is "twelve million, five hundred thirty-nine thousand, eight hundred seventy-three".