13999440 has 160 divisors (see below), whose sum is σ = 53496576. Its totient is φ = 2949120.

The previous prime is 13999423. The next prime is 13999441. The reversal of 13999440 is 4499931.

13999440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21520 + ... + 22160.

Almost surely, 2^13999440 is an apocalyptic number.

13999440 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 13999440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26748288).

13999440 is an abundant number, since it is smaller than the sum of its proper divisors (39497136).

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

13999440 is a wasteful number, since it uses less digits than its factorization.

13999440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 13999440 is about 3741.5825528779. The cubic root of 13999440 is about 241.0110128517.

The spelling of 13999440 in words is "thirteen million, nine hundred ninety-nine thousand, four hundred forty".