12257645 has 8 divisors (see below), whose sum is σ = 14950680. Its totient is φ = 9645120.

The previous prime is 12257627. The next prime is 12257677. The reversal of 12257645 is 54675221.

It can be written as a sum of positive squares in 4 ways, for example, as 1162084 + 11095561 = 1078^2 + 3331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12257645 - 2⁸ = 12257389 is a prime.

It is a super-3 number, since 3×12257645³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19790 + ... + 20399.

It is an arithmetic number, because the mean of its divisors is an integer number (1868835).

Almost surely, 2^12257645 is an apocalyptic number.

It is an amenable number.

12257645 is a deficient number, since it is larger than the sum of its proper divisors (2693035).

12257645 is an equidigital number, since it uses as much as digits as its factorization.

12257645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40255.

The product of its digits is 16800, while the sum is 32.

The square root of 12257645 is about 3501.0919725137. The cubic root of 12257645 is about 230.5697594406.

The spelling of 12257645 in words is "twelve million, two hundred fifty-seven thousand, six hundred forty-five".