12731985 has 56 divisors (see below), whose sum is σ = 26232000. Its totient is φ = 5808672.

The previous prime is 12731969. The next prime is 12731987. The reversal of 12731985 is 58913721.

It is not a de Polignac number, because 12731985 - 2⁴ = 12731969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12731987) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 25266 + ... + 25764.

Almost surely, 2^12731985 is an apocalyptic number.

12731985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12731985 is an abundant number, since it is smaller than the sum of its proper divisors (13500015).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12731985 is an frugal number, since it uses more digits than its factorization.

12731985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 514 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 12731985 is about 3568.1907179970. The cubic root of 12731985 is about 233.5063557948.

The spelling of 12731985 in words is "twelve million, seven hundred thirty-one thousand, nine hundred eighty-five".