12780747 has 20 divisors (see below), whose sum is σ = 21820656. Its totient is φ = 7302960.

The previous prime is 12780743. The next prime is 12780763. The reversal of 12780747 is 74708721.

It is not a de Polignac number, because 12780747 - 2² = 12780743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12780743) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10704 + ... + 11837.

Almost surely, 2^12780747 is an apocalyptic number.

12780747 is a deficient number, since it is larger than the sum of its proper divisors (9039909).

12780747 is an equidigital number, since it uses as much as digits as its factorization.

12780747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22560 (or 22551 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 12780747 is about 3575.0170628963. The cubic root of 12780747 is about 233.8040766344.

The spelling of 12780747 in words is "twelve million, seven hundred eighty thousand, seven hundred forty-seven".