13990 has 8 divisors (see below), whose sum is σ = 25200. Its totient is φ = 5592.

The previous prime is 13967. The next prime is 13997. The reversal of 13990 is 9931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13997) by changing a digit.

13990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690 + ... + 709.

It is an arithmetic number, because the mean of its divisors is an integer number (3150).

2¹³⁹⁹⁰ is an apocalyptic number.

13990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13990 is a deficient number, since it is larger than the sum of its proper divisors (11210).

13990 is a wasteful number, since it uses less digits than its factorization.

13990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 13990 is about 118.2793304005. The cubic root of 13990 is about 24.0956828410.

The spelling of 13990 in words is "thirteen thousand, nine hundred ninety".