12861965 has 4 divisors (see below), whose sum is σ = 15434364. Its totient is φ = 10289568.

The previous prime is 12861949. The next prime is 12861983. The reversal of 12861965 is 56916821.

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 8655364 + 4206601 = 2942^2 + 2051^2 .

It is a cyclic number.

It is not a de Polignac number, because 12861965 - 2⁴ = 12861949 is a prime.

It is a super-2 number, since 2×12861965² = 330860287322450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1286192 + ... + 1286201.

It is an arithmetic number, because the mean of its divisors is an integer number (3858591).

Almost surely, 2^12861965 is an apocalyptic number.

It is an amenable number.

12861965 is a deficient number, since it is larger than the sum of its proper divisors (2572399).

12861965 is an equidigital number, since it uses as much as digits as its factorization.

12861965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572398.

The product of its digits is 25920, while the sum is 38.

The square root of 12861965 is about 3586.3581806618. The cubic root of 12861965 is about 234.2982839882.

The spelling of 12861965 in words is "twelve million, eight hundred sixty-one thousand, nine hundred sixty-five".