13639859 has 2 divisors, whose sum is σ = 13639860. Its totient is φ = 13639858.

The previous prime is 13639841. The next prime is 13639867. The reversal of 13639859 is 95893631.

It is a strong prime.

It is an emirp because it is prime and its reverse (95893631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13639859 - 2²⁰ = 12591283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13639819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819929 + 6819930.

It is an arithmetic number, because the mean of its divisors is an integer number (6819930).

Almost surely, 2^13639859 is an apocalyptic number.

13639859 is a deficient number, since it is larger than the sum of its proper divisors (1).

13639859 is an equidigital number, since it uses as much as digits as its factorization.

13639859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 13639859 is about 3693.2179735293. The cubic root of 13639859 is about 238.9296023472.

The spelling of 13639859 in words is "thirteen million, six hundred thirty-nine thousand, eight hundred fifty-nine".