12780042 has 32 divisors (see below), whose sum is σ = 29099520. Its totient is φ = 3703920.

The previous prime is 12780017. The next prime is 12780113. The reversal of 12780042 is 24008721.

It is a junction number, because it is equal to n+sod(n) for n = 12779994 and 12780021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2692 + ... + 5727.

It is an arithmetic number, because the mean of its divisors is an integer number (909360).

Almost surely, 2^12780042 is an apocalyptic number.

12780042 is an abundant number, since it is smaller than the sum of its proper divisors (16319478).

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

12780042 is a wasteful number, since it uses less digits than its factorization.

12780042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8458.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 12780042 is about 3574.9184606086. The cubic root of 12780042 is about 233.7997775923.

Adding to 12780042 its reverse (24008721), we get a palindrome (36788763).

The spelling of 12780042 in words is "twelve million, seven hundred eighty thousand, forty-two".