13639636 has 12 divisors (see below), whose sum is σ = 23970100. Its totient is φ = 6791040.

The previous prime is 13639631. The next prime is 13639651. The reversal of 13639636 is 63693631.

13639636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11696400 + 1943236 = 3420^2 + 1394^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13639595 and 13639604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13639631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6111 + ... + 8038.

Almost surely, 2^13639636 is an apocalyptic number.

It is an amenable number.

13639636 is a deficient number, since it is larger than the sum of its proper divisors (10330464).

13639636 is a wasteful number, since it uses less digits than its factorization.

13639636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14394 (or 14392 counting only the distinct ones).

The product of its digits is 52488, while the sum is 37.

The square root of 13639636 is about 3693.1877829322. The cubic root of 13639636 is about 238.9283002420.

The spelling of 13639636 in words is "thirteen million, six hundred thirty-nine thousand, six hundred thirty-six".