13999280 has 20 divisors (see below), whose sum is σ = 32548512. Its totient is φ = 5599680.

The previous prime is 13999273. The next prime is 13999289. The reversal of 13999280 is 8299931.

13999280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (13999289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87416 + ... + 87575.

Almost surely, 2^13999280 is an apocalyptic number.

13999280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13999280 is an abundant number, since it is smaller than the sum of its proper divisors (18549232).

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

13999280 is a wasteful number, since it uses less digits than its factorization.

13999280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175004 (or 174998 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 13999280 is about 3741.5611714898. The cubic root of 13999280 is about 241.0100946742.

The spelling of 13999280 in words is "thirteen million, nine hundred ninety-nine thousand, two hundred eighty".