12523639 has 2 divisors, whose sum is σ = 12523640. Its totient is φ = 12523638.

The previous prime is 12523627. The next prime is 12523663. The reversal of 12523639 is 93632521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12523639 - 2⁵ = 12523607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12523639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12523669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6261819 + 6261820.

It is an arithmetic number, because the mean of its divisors is an integer number (6261820).

Almost surely, 2^12523639 is an apocalyptic number.

12523639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12523639 is an equidigital number, since it uses as much as digits as its factorization.

12523639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 12523639 is about 3538.8753863339. The cubic root of 12523639 is about 232.2256462471.

The spelling of 12523639 in words is "twelve million, five hundred twenty-three thousand, six hundred thirty-nine".