12780236 has 24 divisors (see below), whose sum is σ = 26906880. Its totient is φ = 5188752.

The previous prime is 12780223. The next prime is 12780247. The reversal of 12780236 is 63208721.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12780199 and 12780208.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11480 + ... + 12543.

It is an arithmetic number, because the mean of its divisors is an integer number (1121120).

Almost surely, 2^12780236 is an apocalyptic number.

It is an amenable number.

12780236 is an abundant number, since it is smaller than the sum of its proper divisors (14126644).

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

12780236 is a wasteful number, since it uses less digits than its factorization.

12780236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24053 (or 24051 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 12780236 is about 3574.9455939916. The cubic root of 12780236 is about 233.8009606069.

Adding to 12780236 its reverse (63208721), we get a palindrome (75988957).

The spelling of 12780236 in words is "twelve million, seven hundred eighty thousand, two hundred thirty-six".