13921520 has 20 divisors (see below), whose sum is σ = 32367720. Its totient is φ = 5568576.

The previous prime is 13921519. The next prime is 13921549. The reversal of 13921520 is 2512931.

13921520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×13921520² = 387617438220800, which contains 22 as substring.

It is a congruent number.

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, 86930 + ... + 87089.

It is an arithmetic number, because the mean of its divisors is an integer number (1618386).

Almost surely, 2^13921520 is an apocalyptic number.

13921520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13921520 is an abundant number, since it is smaller than the sum of its proper divisors (18446200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13921520 is a wasteful number, since it uses less digits than its factorization.

13921520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174032 (or 174026 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 13921520 is about 3731.1553170566. The cubic root of 13921520 is about 240.5630299742.

It can be divided in two parts, 13921 and 520, that added together give a palindrome (14441).

The spelling of 13921520 in words is "thirteen million, nine hundred twenty-one thousand, five hundred twenty".