2109816 has 24 divisors (see below), whose sum is σ = 5714280. Its totient is φ = 703248.

The previous prime is 2109799. The next prime is 2109841. The reversal of 2109816 is 6189012.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a self number, because there is not a number n which added to its sum of digits gives 2109816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14580 + ... + 14723.

It is an arithmetic number, because the mean of its divisors is an integer number (238095).

2^2109816 is an apocalyptic number.

It is an amenable number.

2109816 is an abundant number, since it is smaller than the sum of its proper divisors (3604464).

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

2109816 is a wasteful number, since it uses less digits than its factorization.

2109816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29315 (or 29308 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2109816 is about 1452.5205678406. The cubic root of 2109816 is about 128.2571328523.

The spelling of 2109816 in words is "two million, one hundred nine thousand, eight hundred sixteen".