2199816 has 24 divisors (see below), whose sum is σ = 5958030. Its totient is φ = 733248.

The previous prime is 2199803. The next prime is 2199823. The reversal of 2199816 is 6189912.

It can be written as a sum of positive squares in only one way, i.e., 2090916 + 108900 = 1446^2 + 330^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

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, 15205 + ... + 15348.

2^2199816 is an apocalyptic number.

It is an amenable number.

2199816 is an abundant number, since it is smaller than the sum of its proper divisors (3758214).

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

2199816 is a wasteful number, since it uses less digits than its factorization.

2199816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30565 (or 30558 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 2199816 is about 1483.1776697348. The cubic root of 2199816 is about 130.0555186927.

The spelling of 2199816 in words is "two million, one hundred ninety-nine thousand, eight hundred sixteen".