2820861 has 24 divisors (see below), whose sum is σ = 4380480. Its totient is φ = 1742976.

The previous prime is 2820833. The next prime is 2820863. The reversal of 2820861 is 1680282.

It is not a de Polignac number, because 2820861 - 2⁷ = 2820733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2820863) 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 23 ways as a sum of consecutive naturals, for example, 15670 + ... + 15848.

It is an arithmetic number, because the mean of its divisors is an integer number (182520).

2^2820861 is an apocalyptic number.

It is an amenable number.

2820861 is a deficient number, since it is larger than the sum of its proper divisors (1559619).

2820861 is a wasteful number, since it uses less digits than its factorization.

2820861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 2820861 is about 1679.5419018292. The cubic root of 2820861 is about 141.2951415486.

The spelling of 2820861 in words is "two million, eight hundred twenty thousand, eight hundred sixty-one".