12658891 has 16 divisors (see below), whose sum is σ = 14904000. Its totient is φ = 10528128.

The previous prime is 12658879. The next prime is 12658949. The reversal of 12658891 is 19885621.

It is a cyclic number.

It is not a de Polignac number, because 12658891 - 2⁹ = 12658379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12658801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55165 + ... + 55393.

It is an arithmetic number, because the mean of its divisors is an integer number (931500).

Almost surely, 2^12658891 is an apocalyptic number.

12658891 is a deficient number, since it is larger than the sum of its proper divisors (2245109).

12658891 is a wasteful number, since it uses less digits than its factorization.

12658891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438.

The product of its digits is 34560, while the sum is 40.

The square root of 12658891 is about 3557.9335294522. The cubic root of 12658891 is about 233.0586465990.

The spelling of 12658891 in words is "twelve million, six hundred fifty-eight thousand, eight hundred ninety-one".