2821858 has 8 divisors (see below), whose sum is σ = 4558428. Its totient is φ = 1302384.

The previous prime is 2821849. The next prime is 2821859. The reversal of 2821858 is 8581282.

It is a happy number.

2821858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2111209 + 710649 = 1453^2 + 843^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2821859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54241 + ... + 54292.

2^2821858 is an apocalyptic number.

2821858 is a deficient number, since it is larger than the sum of its proper divisors (1736570).

2821858 is a wasteful number, since it uses less digits than its factorization.

2821858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108548.

The product of its digits is 10240, while the sum is 34.

The square root of 2821858 is about 1679.8386827312. The cubic root of 2821858 is about 141.3117859541.

The spelling of 2821858 in words is "two million, eight hundred twenty-one thousand, eight hundred fifty-eight".