12431986 has 12 divisors (see below), whose sum is σ = 21692718. Its totient is φ = 5327952.

The previous prime is 12431977. The next prime is 12432011. The reversal of 12431986 is 68913421.

It can be written as a sum of positive squares in only one way, i.e., 6599761 + 5832225 = 2569^2 + 2415^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63331 + ... + 63526.

Almost surely, 2^12431986 is an apocalyptic number.

12431986 is a deficient number, since it is larger than the sum of its proper divisors (9260732).

12431986 is a wasteful number, since it uses less digits than its factorization.

12431986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126873 (or 126866 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 12431986 is about 3525.9021540593. The cubic root of 12431986 is about 231.6577519012.

The spelling of 12431986 in words is "twelve million, four hundred thirty-one thousand, nine hundred eighty-six".