12257409 has 4 divisors (see below), whose sum is σ = 16343216. Its totient is φ = 8171604.

The previous prime is 12257407. The next prime is 12257411. The reversal of 12257409 is 90475221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90475221 = 3 ⋅30158407.

It is an interprime number because it is at equal distance from previous prime (12257407) and next prime (12257411).

It is not a de Polignac number, because 12257409 - 2¹ = 12257407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12257407) 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, 2042899 + ... + 2042904.

It is an arithmetic number, because the mean of its divisors is an integer number (4085804).

Almost surely, 2^12257409 is an apocalyptic number.

It is an amenable number.

12257409 is a deficient number, since it is larger than the sum of its proper divisors (4085807).

12257409 is an equidigital number, since it uses as much as digits as its factorization.

12257409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085806.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 12257409 is about 3501.0582685811. The cubic root of 12257409 is about 230.5682796889.

The spelling of 12257409 in words is "twelve million, two hundred fifty-seven thousand, four hundred nine".