2855866 has 8 divisors (see below), whose sum is σ = 4613364. Its totient is φ = 1318080.

The previous prime is 2855857. The next prime is 2855869. The reversal of 2855866 is 6685582.

It can be written as a sum of positive squares in 2 ways, for example, as 2839225 + 16641 = 1685^2 + 129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2855869) 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 3 ways as a sum of consecutive naturals, for example, 54895 + ... + 54946.

2^2855866 is an apocalyptic number.

2855866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2855866 is a deficient number, since it is larger than the sum of its proper divisors (1757498).

2855866 is a wasteful number, since it uses less digits than its factorization.

2855866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109856.

The product of its digits is 115200, while the sum is 40.

The square root of 2855866 is about 1689.9307678127. The cubic root of 2855866 is about 141.8771999245.

It can be divided in two parts, 2855 and 866, that added together give a square (3721 = 61²).

The spelling of 2855866 in words is "two million, eight hundred fifty-five thousand, eight hundred sixty-six".