13390720 has 128 divisors (see below), whose sum is σ = 37944000. Its totient is φ = 4515840.

The previous prime is 13390709. The next prime is 13390733. The reversal of 13390720 is 2709331.

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

It is a super-2 number, since 2×13390720² = 358622764236800, 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 15 ways as a sum of consecutive naturals, for example, 219490 + ... + 219550.

Almost surely, 2^13390720 is an apocalyptic number.

13390720 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 13390720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18972000).

13390720 is an abundant number, since it is smaller than the sum of its proper divisors (24553280).

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

13390720 is an frugal number, since it uses more digits than its factorization.

13390720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 13390720 is about 3659.3332726058. Note that the first 3 decimals coincide. The cubic root of 13390720 is about 237.4659304777.

The spelling of 13390720 in words is "thirteen million, three hundred ninety thousand, seven hundred twenty".