12556749 has 4 divisors (see below), whose sum is σ = 16742336. Its totient is φ = 8371164.

The previous prime is 12556729. The next prime is 12556751. The reversal of 12556749 is 94765521.

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.

It is not a de Polignac number, because 12556749 - 2⁸ = 12556493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12556729) 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, 2092789 + ... + 2092794.

It is an arithmetic number, because the mean of its divisors is an integer number (4185584).

Almost surely, 2^12556749 is an apocalyptic number.

It is an amenable number.

12556749 is a deficient number, since it is larger than the sum of its proper divisors (4185587).

12556749 is an equidigital number, since it uses as much as digits as its factorization.

12556749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4185586.

The product of its digits is 75600, while the sum is 39.

The square root of 12556749 is about 3543.5503382907. The cubic root of 12556749 is about 232.4301188989.

The spelling of 12556749 in words is "twelve million, five hundred fifty-six thousand, seven hundred forty-nine".