13721636 has 12 divisors (see below), whose sum is σ = 24122112. Its totient is φ = 6829608.

The previous prime is 13721627. The next prime is 13721671. The reversal of 13721636 is 63612731.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 13721599 and 13721608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6800 + ... + 8583.

It is an arithmetic number, because the mean of its divisors is an integer number (2010176).

Almost surely, 2^13721636 is an apocalyptic number.

It is an amenable number.

13721636 is a deficient number, since it is larger than the sum of its proper divisors (10400476).

13721636 is a wasteful number, since it uses less digits than its factorization.

13721636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15610 (or 15608 counting only the distinct ones).

The product of its digits is 4536, while the sum is 29.

The square root of 13721636 is about 3704.2726681496. The cubic root of 13721636 is about 239.4061475329.

The spelling of 13721636 in words is "thirteen million, seven hundred twenty-one thousand, six hundred thirty-six".