12780841 has 4 divisors (see below), whose sum is σ = 12812500. Its totient is φ = 12749184.

The previous prime is 12780827. The next prime is 12780869. The reversal of 12780841 is 14808721.

It is the 1460-th star number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10208025 + 2572816 = 3195^2 + 1604^2 .

It is a cyclic number.

It is not a de Polignac number, because 12780841 - 2⁵ = 12780809 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (12780871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15216 + ... + 16033.

It is an arithmetic number, because the mean of its divisors is an integer number (3203125).

Almost surely, 2^12780841 is an apocalyptic number.

It is an amenable number.

12780841 is a deficient number, since it is larger than the sum of its proper divisors (31659).

12780841 is an equidigital number, since it uses as much as digits as its factorization.

12780841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31658.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 12780841 is about 3575.0302096626. The cubic root of 12780841 is about 233.8046498280.

The spelling of 12780841 in words is "twelve million, seven hundred eighty thousand, eight hundred forty-one".