12656745 has 24 divisors (see below), whose sum is σ = 22109256. Its totient is φ = 6697728.

The previous prime is 12656737. The next prime is 12656783. The reversal of 12656745 is 54765621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1687401 + 10969344 = 1299^2 + 3312^2 .

It is not a de Polignac number, because 12656745 - 2³ = 12656737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5139 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (921219).

Almost surely, 2^12656745 is an apocalyptic number.

12656745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12656745 is a deficient number, since it is larger than the sum of its proper divisors (9452511).

12656745 is a wasteful number, since it uses less digits than its factorization.

12656745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201 (or 2198 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 12656745 is about 3557.6319371177. The cubic root of 12656745 is about 233.0454760898.

The spelling of 12656745 in words is "twelve million, six hundred fifty-six thousand, seven hundred forty-five".