13998809 has 8 divisors (see below), whose sum is σ = 15596928. Its totient is φ = 12454960.

The previous prime is 13998773. The next prime is 13998811. The reversal of 13998809 is 90889931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13998809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13998889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13022 + ... + 14055.

It is an arithmetic number, because the mean of its divisors is an integer number (1949616).

Almost surely, 2^13998809 is an apocalyptic number.

It is an amenable number.

13998809 is a deficient number, since it is larger than the sum of its proper divisors (1598119).

13998809 is a wasteful number, since it uses less digits than its factorization.

13998809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27135.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 13998809 is about 3741.4982293194. The cubic root of 13998809 is about 241.0073917489.

The spelling of 13998809 in words is "thirteen million, nine hundred ninety-eight thousand, eight hundred nine".