13998287 has 4 divisors (see below), whose sum is σ = 14006136. Its totient is φ = 13990440.

The previous prime is 13998251. The next prime is 13998301. The reversal of 13998287 is 78289931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78289931 = 829 ⋅94439.

It is a cyclic number.

It is not a de Polignac number, because 13998287 - 2¹⁸ = 13736143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13998217) 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, 188 + ... + 5294.

It is an arithmetic number, because the mean of its divisors is an integer number (3501534).

Almost surely, 2^13998287 is an apocalyptic number.

13998287 is a deficient number, since it is larger than the sum of its proper divisors (7849).

13998287 is an equidigital number, since it uses as much as digits as its factorization.

13998287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848.

The product of its digits is 217728, while the sum is 47.

The square root of 13998287 is about 3741.4284705176. The cubic root of 13998287 is about 241.0043960792.

The spelling of 13998287 in words is "thirteen million, nine hundred ninety-eight thousand, two hundred eighty-seven".