12780243 has 24 divisors (see below), whose sum is σ = 22340448. Its totient is φ = 6872832.

The previous prime is 12780223. The next prime is 12780247. The reversal of 12780243 is 34208721.

It is not a de Polignac number, because 12780243 - 2⁵ = 12780211 is a prime.

It is a super-2 number, since 2×12780243² = 326669222278098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12780247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4896 + ... + 7037.

It is an arithmetic number, because the mean of its divisors is an integer number (930852).

Almost surely, 2^12780243 is an apocalyptic number.

12780243 is a deficient number, since it is larger than the sum of its proper divisors (9560205).

12780243 is a wasteful number, since it uses less digits than its factorization.

12780243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11963 (or 11960 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 12780243 is about 3574.9465730274. The cubic root of 12780243 is about 233.8010032928.

Adding to 12780243 its reverse (34208721), we get a palindrome (46988964).

The spelling of 12780243 in words is "twelve million, seven hundred eighty thousand, two hundred forty-three".