12782749 has 4 divisors (see below), whose sum is σ = 14608864. Its totient is φ = 10956636.

The previous prime is 12782741. The next prime is 12782761. The reversal of 12782749 is 94728721.

12782749 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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: 94728721 = 349 ⋅271429.

It is a cyclic number.

It is not a de Polignac number, because 12782749 - 2³ = 12782741 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 (12782741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913047 + ... + 913060.

It is an arithmetic number, because the mean of its divisors is an integer number (3652216).

Almost surely, 2^12782749 is an apocalyptic number.

It is an amenable number.

12782749 is a deficient number, since it is larger than the sum of its proper divisors (1826115).

12782749 is an equidigital number, since it uses as much as digits as its factorization.

12782749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826114.

The product of its digits is 56448, while the sum is 40.

The square root of 12782749 is about 3575.2970505959. The cubic root of 12782749 is about 233.8162838323.

It can be divided in two parts, 12782 and 749, that added together give a palindrome (13531).

The spelling of 12782749 in words is "twelve million, seven hundred eighty-two thousand, seven hundred forty-nine".