2815820 has 24 divisors (see below), whose sum is σ = 6758304. Its totient is φ = 965376.

The previous prime is 2815807. The next prime is 2815843. The reversal of 2815820 is 285182.

It is a self number, because there is not a number n which added to its sum of digits gives 2815820.

It is an unprimeable number.

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, 9917 + ... + 10196.

It is an arithmetic number, because the mean of its divisors is an integer number (281596).

2^2815820 is an apocalyptic number.

2815820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2815820 is an abundant number, since it is smaller than the sum of its proper divisors (3942484).

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

2815820 is a wasteful number, since it uses less digits than its factorization.

2815820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20129 (or 20127 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 2815820 is about 1678.0405239445. The cubic root of 2815820 is about 141.2109245293.

The spelling of 2815820 in words is "two million, eight hundred fifteen thousand, eight hundred twenty".