12782393 has 4 divisors (see below), whose sum is σ = 13765668. Its totient is φ = 11799120.

The previous prime is 12782377. The next prime is 12782431. The reversal of 12782393 is 39328721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39328721 = 881 ⋅44641.

It can be written as a sum of positive squares in 2 ways, for example, as 727609 + 12054784 = 853^2 + 3472^2 .

It is a cyclic number.

It is not a de Polignac number, because 12782393 - 2⁴ = 12782377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12782303) 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 3 ways as a sum of consecutive naturals, for example, 491618 + ... + 491643.

It is an arithmetic number, because the mean of its divisors is an integer number (3441417).

Almost surely, 2^12782393 is an apocalyptic number.

12782393 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12782393 is a deficient number, since it is larger than the sum of its proper divisors (983275).

12782393 is an equidigital number, since it uses as much as digits as its factorization.

12782393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983274.

The product of its digits is 18144, while the sum is 35.

The square root of 12782393 is about 3575.2472641763. The cubic root of 12782393 is about 233.8141132149.

The spelling of 12782393 in words is "twelve million, seven hundred eighty-two thousand, three hundred ninety-three".