12457889 has 4 divisors (see below), whose sum is σ = 13190724. Its totient is φ = 11725056.

The previous prime is 12457871. The next prime is 12457897. The reversal of 12457889 is 98875421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98875421 = 359 ⋅275419.

It can be written as a sum of positive squares in 2 ways, for example, as 11662225 + 795664 = 3415^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 12457889 - 2⁸ = 12457633 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (12457859) 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, 366392 + ... + 366425.

It is an arithmetic number, because the mean of its divisors is an integer number (3297681).

Almost surely, 2^12457889 is an apocalyptic number.

It is an amenable number.

12457889 is a deficient number, since it is larger than the sum of its proper divisors (732835).

12457889 is an equidigital number, since it uses as much as digits as its factorization.

12457889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732834.

The product of its digits is 161280, while the sum is 44.

The square root of 12457889 is about 3529.5734869811. The cubic root of 12457889 is about 231.8185325406.

The spelling of 12457889 in words is "twelve million, four hundred fifty-seven thousand, eight hundred eighty-nine".