13487920 has 20 divisors (see below), whose sum is σ = 31359600. Its totient is φ = 5395136.

The previous prime is 13487911. The next prime is 13487921. The reversal of 13487920 is 2978431.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13487921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84220 + ... + 84379.

It is an arithmetic number, because the mean of its divisors is an integer number (1567980).

Almost surely, 2^13487920 is an apocalyptic number.

13487920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13487920 is an abundant number, since it is smaller than the sum of its proper divisors (17871680).

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

13487920 is a wasteful number, since it uses less digits than its factorization.

13487920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168612 (or 168606 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 13487920 is about 3672.5903664852. The cubic root of 13487920 is about 238.0391151021.

The spelling of 13487920 in words is "thirteen million, four hundred eighty-seven thousand, nine hundred twenty".