2821851 has 8 divisors (see below), whose sum is σ = 4180560. Its totient is φ = 1881216.

The previous prime is 2821849. The next prime is 2821859. The reversal of 2821851 is 1581282.

It is not a de Polignac number, because 2821851 - 2¹ = 2821849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 104513 = 2821851 / (2 + 8 + 2 + 1 + 8 + 5 + 1).

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52230 + ... + 52283.

It is an arithmetic number, because the mean of its divisors is an integer number (522570).

2^2821851 is an apocalyptic number.

2821851 is a deficient number, since it is larger than the sum of its proper divisors (1358709).

2821851 is a wasteful number, since it uses less digits than its factorization.

2821851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104522 (or 104516 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 2821851 is about 1679.8365991965. The cubic root of 2821851 is about 141.3116691063.

The spelling of 2821851 in words is "two million, eight hundred twenty-one thousand, eight hundred fifty-one".