12731398 has 4 divisors (see below), whose sum is σ = 19097100. Its totient is φ = 6365698.

The previous prime is 12731363. The next prime is 12731399. The reversal of 12731398 is 89313721.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3182848 + ... + 3182851.

It is an arithmetic number, because the mean of its divisors is an integer number (4774275).

Almost surely, 2^12731398 is an apocalyptic number.

12731398 is a deficient number, since it is larger than the sum of its proper divisors (6365702).

12731398 is an equidigital number, since it uses as much as digits as its factorization.

12731398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6365701.

The product of its digits is 9072, while the sum is 34.

The square root of 12731398 is about 3568.1084624770. The cubic root of 12731398 is about 233.5027671861.

The spelling of 12731398 in words is "twelve million, seven hundred thirty-one thousand, three hundred ninety-eight".