12731998 has 8 divisors (see below), whose sum is σ = 19122192. Its totient is φ = 6357936.

The previous prime is 12731993. The next prime is 12732001. The reversal of 12731998 is 89913721.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12731998.

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 3 ways as a sum of consecutive naturals, for example, 1815 + ... + 5362.

It is an arithmetic number, because the mean of its divisors is an integer number (2390274).

Almost surely, 2^12731998 is an apocalyptic number.

12731998 is a deficient number, since it is larger than the sum of its proper divisors (6390194).

12731998 is an equidigital number, since it uses as much as digits as its factorization.

12731998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8066.

The product of its digits is 27216, while the sum is 40.

The square root of 12731998 is about 3568.1925396480. The cubic root of 12731998 is about 233.5064352687.

The spelling of 12731998 in words is "twelve million, seven hundred thirty-one thousand, nine hundred ninety-eight".