12391284 has 12 divisors (see below), whose sum is σ = 28913024. Its totient is φ = 4130424.

The previous prime is 12391261. The next prime is 12391297. The reversal of 12391284 is 48219321.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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, 516292 + ... + 516315.

Almost surely, 2^12391284 is an apocalyptic number.

It is an amenable number.

12391284 is an abundant number, since it is smaller than the sum of its proper divisors (16521740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12391284 is a wasteful number, since it uses less digits than its factorization.

12391284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032614 (or 1032612 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 12391284 is about 3520.1255659422. The cubic root of 12391284 is about 231.4046616708.

The spelling of 12391284 in words is "twelve million, three hundred ninety-one thousand, two hundred eighty-four".