12777749 has 4 divisors (see below), whose sum is σ = 13049664. Its totient is φ = 12505836.

The previous prime is 12777703. The next prime is 12777763. The reversal of 12777749 is 94777721.

12777749 is digitally balanced in base 2, 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: 94777721 = 227 ⋅417523.

It is a cyclic number.

It is not a de Polignac number, because 12777749 - 2¹² = 12773653 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 (12777049) 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, 135887 + ... + 135980.

It is an arithmetic number, because the mean of its divisors is an integer number (3262416).

Almost surely, 2^12777749 is an apocalyptic number.

It is an amenable number.

12777749 is a deficient number, since it is larger than the sum of its proper divisors (271915).

12777749 is an equidigital number, since it uses as much as digits as its factorization.

12777749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271914.

The product of its digits is 172872, while the sum is 44.

The square root of 12777749 is about 3574.5977396065. The cubic root of 12777749 is about 233.7857939410.

The spelling of 12777749 in words is "twelve million, seven hundred seventy-seven thousand, seven hundred forty-nine".