2821800 has 48 divisors (see below), whose sum is σ = 8749440. Its totient is φ = 752320.

The previous prime is 2821771. The next prime is 2821807. The reversal of 2821800 is 81282.

It is not an unprimeable number, because it can be changed into a prime (2821807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1752 + ... + 2951.

It is an arithmetic number, because the mean of its divisors is an integer number (182280).

2^2821800 is an apocalyptic number.

2821800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2821800 is an abundant number, since it is smaller than the sum of its proper divisors (5927640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2821800 is a wasteful number, since it uses less digits than its factorization.

2821800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4722 (or 4713 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 2821800 is about 1679.8214190800. The cubic root of 2821800 is about 141.3108177811.

The spelling of 2821800 in words is "two million, eight hundred twenty-one thousand, eight hundred".