13989687 has 12 divisors (see below), whose sum is σ = 19344360. Its totient is φ = 8982400.

The previous prime is 13989641. The next prime is 13989709. The reversal of 13989687 is 78698931.

It is not a de Polignac number, because 13989687 - 2¹⁶ = 13924151 is a prime.

It is a super-2 number, since 2×13989687² = 391422684715938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13989617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34687 + ... + 35087.

It is an arithmetic number, because the mean of its divisors is an integer number (1612030).

Almost surely, 2^13989687 is an apocalyptic number.

13989687 is a deficient number, since it is larger than the sum of its proper divisors (5354673).

13989687 is an frugal number, since it uses more digits than its factorization.

13989687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 433 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 13989687 is about 3740.2790002886. The cubic root of 13989687 is about 240.9550314105.

The spelling of 13989687 in words is "thirteen million, nine hundred eighty-nine thousand, six hundred eighty-seven".