12684989 has 4 divisors (see below), whose sum is σ = 13352640. Its totient is φ = 12017340.

The previous prime is 12684979. The next prime is 12685007. The reversal of 12684989 is 98948621.

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 12684989 - 2¹² = 12680893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12684929) 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, 333797 + ... + 333834.

It is an arithmetic number, because the mean of its divisors is an integer number (3338160).

Almost surely, 2^12684989 is an apocalyptic number.

12684989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12684989 is a deficient number, since it is larger than the sum of its proper divisors (667651).

12684989 is an equidigital number, since it uses as much as digits as its factorization.

12684989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667650.

The product of its digits is 248832, while the sum is 47.

The square root of 12684989 is about 3561.5992194518. The cubic root of 12684989 is about 233.2186972035.

The spelling of 12684989 in words is "twelve million, six hundred eighty-four thousand, nine hundred eighty-nine".