2105818 has 32 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 855360.

The previous prime is 2105813. The next prime is 2105819. The reversal of 2105818 is 8185012.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2105792 and 2105801.

It is not an unprimeable number, because it can be changed into a prime (2105813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10483 + ... + 10681.

It is an arithmetic number, because the mean of its divisors is an integer number (119700).

2^2105818 is an apocalyptic number.

2105818 is a deficient number, since it is larger than the sum of its proper divisors (1724582).

2105818 is a wasteful number, since it uses less digits than its factorization.

2105818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 2105818 is about 1451.1436868898. The cubic root of 2105818 is about 128.1760679235.

The spelling of 2105818 in words is "two million, one hundred five thousand, eight hundred eighteen".