12889439 has 4 divisors (see below), whose sum is σ = 12907224. Its totient is φ = 12871656.

The previous prime is 12889433. The next prime is 12889447. The reversal of 12889439 is 93498821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12889439 - 2⁴ = 12889423 is a prime.

It is a super-2 number, since 2×12889439² = 332275275469442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12889439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12889433) 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, 7757 + ... + 9270.

It is an arithmetic number, because the mean of its divisors is an integer number (3226806).

Almost surely, 2^12889439 is an apocalyptic number.

12889439 is a deficient number, since it is larger than the sum of its proper divisors (17785).

12889439 is an equidigital number, since it uses as much as digits as its factorization.

12889439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17784.

The product of its digits is 124416, while the sum is 44.

The square root of 12889439 is about 3590.1864854071. The cubic root of 12889439 is about 234.4649908411.

The spelling of 12889439 in words is "twelve million, eight hundred eighty-nine thousand, four hundred thirty-nine".