12887689 has 4 divisors (see below), whose sum is σ = 12900420. Its totient is φ = 12874960.

The previous prime is 12887657. The next prime is 12887713. The reversal of 12887689 is 98678821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98678821 = 79 ⋅1249099.

It can be written as a sum of positive squares in 2 ways, for example, as 518400 + 12369289 = 720^2 + 3517^2 .

It is a cyclic number.

It is not a de Polignac number, because 12887689 - 2⁵ = 12887657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12887089) 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, 4702 + ... + 6919.

It is an arithmetic number, because the mean of its divisors is an integer number (3225105).

Almost surely, 2^12887689 is an apocalyptic number.

It is an amenable number.

12887689 is a deficient number, since it is larger than the sum of its proper divisors (12731).

12887689 is a wasteful number, since it uses less digits than its factorization.

12887689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12730.

The product of its digits is 387072, while the sum is 49.

The square root of 12887689 is about 3589.9427572038. The cubic root of 12887689 is about 234.4543792517.

The spelling of 12887689 in words is "twelve million, eight hundred eighty-seven thousand, six hundred eighty-nine".