13639799 has 2 divisors, whose sum is σ = 13639800. Its totient is φ = 13639798.

The previous prime is 13639789. The next prime is 13639807. The reversal of 13639799 is 99793631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13639799 - 2⁸ = 13639543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13639789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819899 + 6819900.

It is an arithmetic number, because the mean of its divisors is an integer number (6819900).

Almost surely, 2^13639799 is an apocalyptic number.

13639799 is a deficient number, since it is larger than the sum of its proper divisors (1).

13639799 is an equidigital number, since it uses as much as digits as its factorization.

13639799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 47.

The square root of 13639799 is about 3693.2098505230. The cubic root of 13639799 is about 238.9292520064.

The spelling of 13639799 in words is "thirteen million, six hundred thirty-nine thousand, seven hundred ninety-nine".