12665943 has 16 divisors (see below), whose sum is σ = 19084800. Its totient is φ = 8299800.

The previous prime is 12665941. The next prime is 12665957. The reversal of 12665943 is 34956621.

It is a happy number.

12665943 is a `hidden beast` number, since 1 + 2 + 66 + 594 + 3 = 666.

It is not a de Polignac number, because 12665943 - 2¹ = 12665941 is a prime.

It is a super-2 number, since 2×12665943² = 320852224158498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12665898 and 12665907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2383 + ... + 5568.

It is an arithmetic number, because the mean of its divisors is an integer number (1192800).

Almost surely, 2^12665943 is an apocalyptic number.

12665943 is a deficient number, since it is larger than the sum of its proper divisors (6418857).

12665943 is an equidigital number, since it uses as much as digits as its factorization.

12665943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8019 (or 8013 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 12665943 is about 3558.9244161685. The cubic root of 12665943 is about 233.1019159101.

The spelling of 12665943 in words is "twelve million, six hundred sixty-five thousand, nine hundred forty-three".