2851820 has 12 divisors (see below), whose sum is σ = 5988864. Its totient is φ = 1140720.

The previous prime is 2851817. The next prime is 2851829. The reversal of 2851820 is 281582.

It is a self number, because there is not a number n which added to its sum of digits gives 2851820.

It is not an unprimeable number, because it can be changed into a prime (2851829) 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, 71276 + ... + 71315.

It is an arithmetic number, because the mean of its divisors is an integer number (499072).

2^2851820 is an apocalyptic number.

2851820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2851820 is an abundant number, since it is smaller than the sum of its proper divisors (3137044).

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

2851820 is a wasteful number, since it uses less digits than its factorization.

2851820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142600 (or 142598 counting only the distinct ones).

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

The square root of 2851820 is about 1688.7332530628. The cubic root of 2851820 is about 141.8101675486.

The spelling of 2851820 in words is "two million, eight hundred fifty-one thousand, eight hundred twenty".