2820817 has 2 divisors, whose sum is σ = 2820818. Its totient is φ = 2820816.

The previous prime is 2820809. The next prime is 2820821. The reversal of 2820817 is 7180282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1838736 + 982081 = 1356^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 2820817 - 2³ = 2820809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2820877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410408 + 1410409.

It is an arithmetic number, because the mean of its divisors is an integer number (1410409).

2^2820817 is an apocalyptic number.

It is an amenable number.

2820817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2820817 is an equidigital number, since it uses as much as digits as its factorization.

2820817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2820817 is about 1679.5288029683. The cubic root of 2820817 is about 141.2944069007.

The spelling of 2820817 in words is "two million, eight hundred twenty thousand, eight hundred seventeen".