13979520 has 128 divisors (see below), whose sum is σ = 49572000. Its totient is φ = 3723264.

The previous prime is 13979507. The next prime is 13979527. The reversal of 13979520 is 2597931.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13979527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16876 + ... + 17684.

Almost surely, 2^13979520 is an apocalyptic number.

13979520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13979520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24786000).

13979520 is an abundant number, since it is smaller than the sum of its proper divisors (35592480).

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

13979520 is an equidigital number, since it uses as much as digits as its factorization.

13979520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 13979520 is about 3738.9196300536. The cubic root of 13979520 is about 240.8966459368.

The spelling of 13979520 in words is "thirteen million, nine hundred seventy-nine thousand, five hundred twenty".