2821855 has 4 divisors (see below), whose sum is σ = 3386232. Its totient is φ = 2257480.

The previous prime is 2821849. The next prime is 2821859. The reversal of 2821855 is 5581282.

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

It is not a de Polignac number, because 2821855 - 2¹³ = 2813663 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821859) 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, 282181 + ... + 282190.

It is an arithmetic number, because the mean of its divisors is an integer number (846558).

2^2821855 is an apocalyptic number.

2821855 is a deficient number, since it is larger than the sum of its proper divisors (564377).

2821855 is an equidigital number, since it uses as much as digits as its factorization.

2821855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564376.

The product of its digits is 6400, while the sum is 31.

The square root of 2821855 is about 1679.8377897880. The cubic root of 2821855 is about 141.3117358765.

The spelling of 2821855 in words is "two million, eight hundred twenty-one thousand, eight hundred fifty-five".