12539729 has 2 divisors, whose sum is σ = 12539730. Its totient is φ = 12539728.

The previous prime is 12539711. The next prime is 12539743. The reversal of 12539729 is 92793521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6512704 + 6027025 = 2552^2 + 2455^2 .

It is a cyclic number.

It is not a de Polignac number, because 12539729 - 2²⁰ = 11491153 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12539692 and 12539701.

It is not a weakly prime, because it can be changed into another prime (12539759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6269864 + 6269865.

It is an arithmetic number, because the mean of its divisors is an integer number (6269865).

Almost surely, 2^12539729 is an apocalyptic number.

It is an amenable number.

12539729 is a deficient number, since it is larger than the sum of its proper divisors (1).

12539729 is an equidigital number, since it uses as much as digits as its factorization.

12539729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 38.

The square root of 12539729 is about 3541.1479777044. The cubic root of 12539729 is about 232.3250558943.

The spelling of 12539729 in words is "twelve million, five hundred thirty-nine thousand, seven hundred twenty-nine".