2105816 has 8 divisors (see below), whose sum is σ = 3948420. Its totient is φ = 1052904.

The previous prime is 2105813. The next prime is 2105819. The reversal of 2105816 is 6185012.

It is an interprime number because it is at equal distance from previous prime (2105813) and next prime (2105819).

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×2105816² = 8868922051712, which contains 22 as substring.

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 = 2105791 and 2105800.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131606 + ... + 131621.

2^2105816 is an apocalyptic number.

It is an amenable number.

2105816 is a deficient number, since it is larger than the sum of its proper divisors (1842604).

2105816 is a wasteful number, since it uses less digits than its factorization.

2105816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263233 (or 263229 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2105816 is about 1451.1429977780. The cubic root of 2105816 is about 128.1760273451.

The spelling of 2105816 in words is "two million, one hundred five thousand, eight hundred sixteen".