12831389 has 4 divisors (see below), whose sum is σ = 12851520. Its totient is φ = 12811260.

The previous prime is 12831383. The next prime is 12831391. The reversal of 12831389 is 98313821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12831389 - 2¹² = 12827293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12831383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9077 + ... + 10394.

It is an arithmetic number, because the mean of its divisors is an integer number (3212880).

Almost surely, 2^12831389 is an apocalyptic number.

It is an amenable number.

12831389 is a deficient number, since it is larger than the sum of its proper divisors (20131).

12831389 is an equidigital number, since it uses as much as digits as its factorization.

12831389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20130.

The product of its digits is 10368, while the sum is 35.

The square root of 12831389 is about 3582.0928240346. The cubic root of 12831389 is about 234.1124754533.

The spelling of 12831389 in words is "twelve million, eight hundred thirty-one thousand, three hundred eighty-nine".