12889813 has 4 divisors (see below), whose sum is σ = 12975328. Its totient is φ = 12804300.

The previous prime is 12889787. The next prime is 12889819. The reversal of 12889813 is 31898821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12889813 - 2⁹ = 12889301 is a prime.

It is a super-2 number, since 2×12889813² = 332294558349938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12889819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42531 + ... + 42832.

It is an arithmetic number, because the mean of its divisors is an integer number (3243832).

Almost surely, 2^12889813 is an apocalyptic number.

It is an amenable number.

12889813 is a deficient number, since it is larger than the sum of its proper divisors (85515).

12889813 is an equidigital number, since it uses as much as digits as its factorization.

12889813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85514.

The product of its digits is 27648, while the sum is 40.

The square root of 12889813 is about 3590.2385714601. The cubic root of 12889813 is about 234.4672585648.

The spelling of 12889813 in words is "twelve million, eight hundred eighty-nine thousand, eight hundred thirteen".