12499639 has 2 divisors, whose sum is σ = 12499640. Its totient is φ = 12499638.

The previous prime is 12499631. The next prime is 12499651. The reversal of 12499639 is 93699421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12499639 - 2³ = 12499631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12499595 and 12499604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12499631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6249819 + 6249820.

It is an arithmetic number, because the mean of its divisors is an integer number (6249820).

Almost surely, 2^12499639 is an apocalyptic number.

12499639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12499639 is an equidigital number, since it uses as much as digits as its factorization.

12499639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 12499639 is about 3535.4828524545. The cubic root of 12499639 is about 232.0772075077.

The spelling of 12499639 in words is "twelve million, four hundred ninety-nine thousand, six hundred thirty-nine".