13639493 has 12 divisors (see below), whose sum is σ = 15967980. Its totient is φ = 11616192.

The previous prime is 13639481. The next prime is 13639513. The reversal of 13639493 is 39493631.

It can be written as a sum of positive squares in 2 ways, for example, as 12945604 + 693889 = 3598^2 + 833^2 .

It is not a de Polignac number, because 13639493 - 2⁸ = 13639237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13639433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7673 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (1330665).

Almost surely, 2^13639493 is an apocalyptic number.

It is an amenable number.

13639493 is a deficient number, since it is larger than the sum of its proper divisors (2328487).

13639493 is a wasteful number, since it uses less digits than its factorization.

13639493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796 (or 1789 counting only the distinct ones).

The product of its digits is 52488, while the sum is 38.

The square root of 13639493 is about 3693.1684229128. The cubic root of 13639493 is about 238.9274652523.

The spelling of 13639493 in words is "thirteen million, six hundred thirty-nine thousand, four hundred ninety-three".