12457989 has 8 divisors (see below), whose sum is σ = 18456320. Its totient is φ = 8305308.

The previous prime is 12457981. The next prime is 12457993. The reversal of 12457989 is 98975421.

12457989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12457989 - 2³ = 12457981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12457981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230677 + ... + 230730.

It is an arithmetic number, because the mean of its divisors is an integer number (2307040).

Almost surely, 2^12457989 is an apocalyptic number.

It is an amenable number.

12457989 is a deficient number, since it is larger than the sum of its proper divisors (5998331).

12457989 is an equidigital number, since it uses as much as digits as its factorization.

12457989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461416 (or 461410 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 12457989 is about 3529.5876529702. The cubic root of 12457989 is about 231.8191528113.

The spelling of 12457989 in words is "twelve million, four hundred fifty-seven thousand, nine hundred eighty-nine".