13990720 has 28 divisors (see below), whose sum is σ = 33316164. Its totient is φ = 5596160.

The previous prime is 13990687. The next prime is 13990721. The reversal of 13990720 is 2709931.

13990720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7354944 + 6635776 = 2712^2 + 2576^2 .

It is a super-2 number, since 2×13990720² = 391480492236800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13990721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21541 + ... + 22180.

It is an arithmetic number, because the mean of its divisors is an integer number (1189863).

Almost surely, 2^13990720 is an apocalyptic number.

13990720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13990720 is an abundant number, since it is smaller than the sum of its proper divisors (19325444).

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

13990720 is an equidigital number, since it uses as much as digits as its factorization.

13990720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43738 (or 43728 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 13990720 is about 3740.4170890423. The cubic root of 13990720 is about 240.9609619797.

The spelling of 13990720 in words is "thirteen million, nine hundred ninety thousand, seven hundred twenty".