13999640 has 32 divisors (see below), whose sum is σ = 32870880. Its totient is φ = 5356032.

The previous prime is 13999621. The next prime is 13999651. The reversal of 13999640 is 4699931.

13999640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6689 + ... + 8528.

It is an arithmetic number, because the mean of its divisors is an integer number (1027215).

Almost surely, 2^13999640 is an apocalyptic number.

13999640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13999640 is an abundant number, since it is smaller than the sum of its proper divisors (18871240).

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

13999640 is a wasteful number, since it uses less digits than its factorization.

13999640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15251 (or 15247 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 13999640 is about 3741.6092794411. The cubic root of 13999640 is about 241.0121605636.

The spelling of 13999640 in words is "thirteen million, nine hundred ninety-nine thousand, six hundred forty".