13904720 has 40 divisors (see below), whose sum is σ = 32542560. Its totient is φ = 5525120.

The previous prime is 13904701. The next prime is 13904729. The reversal of 13904720 is 2740931.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 13904720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13904729) 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, 13835 + ... + 14805.

It is an arithmetic number, because the mean of its divisors is an integer number (813564).

Almost surely, 2^13904720 is an apocalyptic number.

13904720 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 13904720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16271280).

13904720 is an abundant number, since it is smaller than the sum of its proper divisors (18637840).

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

13904720 is a wasteful number, since it uses less digits than its factorization.

13904720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163 (or 1157 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 13904720 is about 3728.9033240351. The cubic root of 13904720 is about 240.4662233589.

The spelling of 13904720 in words is "thirteen million, nine hundred four thousand, seven hundred twenty".