13397720 has 64 divisors (see below), whose sum is σ = 35078400. Its totient is φ = 4510080.

The previous prime is 13397719. The next prime is 13397729. The reversal of 13397720 is 2779331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13397729) 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 15 ways as a sum of consecutive naturals, for example, 16115 + ... + 16925.

It is an arithmetic number, because the mean of its divisors is an integer number (548100).

Almost surely, 2^13397720 is an apocalyptic number.

13397720 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 13397720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17539200).

13397720 is an abundant number, since it is smaller than the sum of its proper divisors (21680680).

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

13397720 is a wasteful number, since it uses less digits than its factorization.

13397720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 13397720 is about 3660.2896060285. The cubic root of 13397720 is about 237.5073017146.

The spelling of 13397720 in words is "thirteen million, three hundred ninety-seven thousand, seven hundred twenty".