12782231 has 16 divisors (see below), whose sum is σ = 16776960. Its totient is φ = 9434880.

The previous prime is 12782219. The next prime is 12782233. The reversal of 12782231 is 13228721.

It is a de Polignac number, because none of the positive numbers 2^k-12782231 is a prime.

It is a super-2 number, since 2×12782231² = 326770858674722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12782231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12782233) 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 15 ways as a sum of consecutive naturals, for example, 2906 + ... + 5831.

It is an arithmetic number, because the mean of its divisors is an integer number (1048560).

Almost surely, 2^12782231 is an apocalyptic number.

12782231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12782231 is a deficient number, since it is larger than the sum of its proper divisors (3994729).

12782231 is a wasteful number, since it uses less digits than its factorization.

12782231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8774.

The product of its digits is 1344, while the sum is 26.

The square root of 12782231 is about 3575.2246083288. The cubic root of 12782231 is about 233.8131254487.

The spelling of 12782231 in words is "twelve million, seven hundred eighty-two thousand, two hundred thirty-one".