13089987 has 6 divisors (see below), whose sum is σ = 18907772. Its totient is φ = 8726652.

The previous prime is 13089977. The next prime is 13089997. The reversal of 13089987 is 78998031.

It is an interprime number because it is at equal distance from previous prime (13089977) and next prime (13089997).

It is not a de Polignac number, because 13089987 - 2⁸ = 13089731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13089977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 727213 + ... + 727230.

Almost surely, 2^13089987 is an apocalyptic number.

13089987 is a deficient number, since it is larger than the sum of its proper divisors (5817785).

13089987 is a wasteful number, since it uses less digits than its factorization.

13089987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454449 (or 1454446 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 13089987 is about 3618.0087064572. The cubic root of 13089987 is about 235.6747590550.

The spelling of 13089987 in words is "thirteen million, eighty-nine thousand, nine hundred eighty-seven".