13997440 has 32 divisors (see below), whose sum is σ = 33464160. Its totient is φ = 5598720.

The previous prime is 13997413. The next prime is 13997483. The reversal of 13997440 is 4479931.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 13997440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10296 + ... + 11575.

It is an arithmetic number, because the mean of its divisors is an integer number (1045755).

Almost surely, 2^13997440 is an apocalyptic number.

13997440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13997440 is an abundant number, since it is smaller than the sum of its proper divisors (19466720).

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

13997440 is an equidigital number, since it uses as much as digits as its factorization.

13997440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21890 (or 21878 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 13997440 is about 3741.3152767443. The cubic root of 13997440 is about 240.9995351311. Note that the first 3 decimals are identical.

It can be divided in two parts, 139 and 97440, that added together give a palindrome (97579).

The spelling of 13997440 in words is "thirteen million, nine hundred ninety-seven thousand, four hundred forty".