12731997 has 8 divisors (see below), whose sum is σ = 17974656. Its totient is φ = 7988672.

The previous prime is 12731993. The next prime is 12732001. The reversal of 12731997 is 79913721.

It is an interprime number because it is at equal distance from previous prime (12731993) and next prime (12732001).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12731997 - 2² = 12731993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731993) 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 7 ways as a sum of consecutive naturals, for example, 124773 + ... + 124874.

It is an arithmetic number, because the mean of its divisors is an integer number (2246832).

Almost surely, 2^12731997 is an apocalyptic number.

12731997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12731997 is a deficient number, since it is larger than the sum of its proper divisors (5242659).

12731997 is a wasteful number, since it uses less digits than its factorization.

12731997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249667.

The product of its digits is 23814, while the sum is 39.

The square root of 12731997 is about 3568.1923995211. The cubic root of 12731997 is about 233.5064291553.

The spelling of 12731997 in words is "twelve million, seven hundred thirty-one thousand, nine hundred ninety-seven".