2820866 has 12 divisors (see below), whose sum is σ = 4320342. Its totient is φ = 1381104.

The previous prime is 2820863. The next prime is 2820869. The reversal of 2820866 is 6680282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2820863) and next prime (2820869).

It can be written as a sum of positive squares in only one way, i.e., 2337841 + 483025 = 1529^2 + 695^2 .

It is an Ulam number.

It is a d-powerful number, because it can be written as 2 + 8⁵ + 2¹⁷ + 0 + 8⁷ + 6⁷ + 6⁷ .

It is not an unprimeable number, because it can be changed into a prime (2820863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20225 + ... + 20363.

2^2820866 is an apocalyptic number.

2820866 is a deficient number, since it is larger than the sum of its proper divisors (1499476).

2820866 is an equidigital number, since it uses as much as digits as its factorization.

2820866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 2820866 is about 1679.5433903296. The cubic root of 2820866 is about 141.2952250308.

The spelling of 2820866 in words is "two million, eight hundred twenty thousand, eight hundred sixty-six".