13920724 has 24 divisors (see below), whose sum is σ = 24980480. Its totient is φ = 6785856.

The previous prime is 13920721. The next prime is 13920737. The reversal of 13920724 is 42702931.

13920724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 13920692 and 13920701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13920721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33832 + ... + 34240.

Almost surely, 2^13920724 is an apocalyptic number.

It is an amenable number.

13920724 is a deficient number, since it is larger than the sum of its proper divisors (11059756).

13920724 is a wasteful number, since it uses less digits than its factorization.

13920724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 13920724 is about 3731.0486461583. The cubic root of 13920724 is about 240.5584449427.

The spelling of 13920724 in words is "thirteen million, nine hundred twenty thousand, seven hundred twenty-four".