2851866 has 24 divisors (see below), whose sum is σ = 6312384. Its totient is φ = 930120.

The previous prime is 2851861. The next prime is 2851867. The reversal of 2851866 is 6681582.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2851866.

It is not an unprimeable number, because it can be changed into a prime (2851861) 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, 840 + ... + 2531.

It is an arithmetic number, because the mean of its divisors is an integer number (263016).

2^2851866 is an apocalyptic number.

2851866 is an abundant number, since it is smaller than the sum of its proper divisors (3460518).

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

2851866 is a wasteful number, since it uses less digits than its factorization.

2851866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426 (or 3423 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2851866 is about 1688.7468726840. The cubic root of 2851866 is about 141.8109300129.

The spelling of 2851866 in words is "two million, eight hundred fifty-one thousand, eight hundred sixty-six".