12790861 has 4 divisors (see below), whose sum is σ = 13032252. Its totient is φ = 12549472.

The previous prime is 12790859. The next prime is 12790889. The reversal of 12790861 is 16809721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11594025 + 1196836 = 3405^2 + 1094^2 .

It is a cyclic number.

It is not a de Polignac number, because 12790861 - 2¹ = 12790859 is a prime.

It is a super-2 number, since 2×12790861² = 327212250242642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12790061) 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, 120616 + ... + 120721.

It is an arithmetic number, because the mean of its divisors is an integer number (3258063).

Almost surely, 2^12790861 is an apocalyptic number.

It is an amenable number.

12790861 is a deficient number, since it is larger than the sum of its proper divisors (241391).

12790861 is an equidigital number, since it uses as much as digits as its factorization.

12790861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241390.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 12790861 is about 3576.4313218626. The cubic root of 12790861 is about 233.8657337227.

The spelling of 12790861 in words is "twelve million, seven hundred ninety thousand, eight hundred sixty-one".