13995989 has 16 divisors (see below), whose sum is σ = 17203200. Its totient is φ = 11118384.

The previous prime is 13995977. The next prime is 13995991. The reversal of 13995989 is 98959931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13995989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13995989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13995959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5132 + ... + 7370.

It is an arithmetic number, because the mean of its divisors is an integer number (1075200).

Almost surely, 2^13995989 is an apocalyptic number.

13995989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

13995989 is a deficient number, since it is larger than the sum of its proper divisors (3207211).

13995989 is a wasteful number, since it uses less digits than its factorization.

13995989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312.

The product of its digits is 787320, while the sum is 53.

The square root of 13995989 is about 3741.1213559573. The cubic root of 13995989 is about 240.9912073604.

The spelling of 13995989 in words is "thirteen million, nine hundred ninety-five thousand, nine hundred eighty-nine".