12749287 has 4 divisors (see below), whose sum is σ = 12764080. Its totient is φ = 12734496.

The previous prime is 12749273. The next prime is 12749293. The reversal of 12749287 is 78294721.

12749287 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 an emirpimes, since its reverse is a distinct semiprime: 78294721 = 563 ⋅139067.

It is a 5-Lehmer number, since φ(12749287) divides (12749287-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 12749287 - 2⁷ = 12749159 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 (12759287) 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, 6018 + ... + 7855.

It is an arithmetic number, because the mean of its divisors is an integer number (3191020).

Almost surely, 2^12749287 is an apocalyptic number.

12749287 is a deficient number, since it is larger than the sum of its proper divisors (14793).

12749287 is an equidigital number, since it uses as much as digits as its factorization.

12749287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14792.

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

The square root of 12749287 is about 3570.6143729056. The cubic root of 12749287 is about 233.6120816041.

The spelling of 12749287 in words is "twelve million, seven hundred forty-nine thousand, two hundred eighty-seven".