2776861 has 4 divisors (see below), whose sum is σ = 2781724. Its totient is φ = 2772000.

The previous prime is 2776849. The next prime is 2776867. The reversal of 2776861 is 1686772.

It is a happy 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 1071225 + 1705636 = 1035^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 2776861 - 2⁷ = 2776733 is a prime.

It is a Duffinian number.

2776861 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2776861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2776867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1440 + ... + 2761.

It is an arithmetic number, because the mean of its divisors is an integer number (695431).

2^2776861 is an apocalyptic number.

It is an amenable number.

2776861 is a deficient number, since it is larger than the sum of its proper divisors (4863).

2776861 is an equidigital number, since it uses as much as digits as its factorization.

2776861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4862.

The product of its digits is 28224, while the sum is 37.

The square root of 2776861 is about 1666.3916106366. The cubic root of 2776861 is about 140.5566443755.

The spelling of 2776861 in words is "two million, seven hundred seventy-six thousand, eight hundred sixty-one".