2199818 has 8 divisors (see below), whose sum is σ = 3362148. Its totient is φ = 1079104.

The previous prime is 2199803. The next prime is 2199823. The reversal of 2199818 is 8189912.

It can be written as a sum of positive squares in 2 ways, for example, as 2199289 + 529 = 1483^2 + 23^2 .

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

It is an Ulam number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 10271 + ... + 10482.

2^2199818 is an apocalyptic number.

2199818 is a deficient number, since it is larger than the sum of its proper divisors (1162330).

2199818 is a wasteful number, since it uses less digits than its factorization.

2199818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20808.

The product of its digits is 10368, while the sum is 38.

The square root of 2199818 is about 1483.1783439627. The cubic root of 2199818 is about 130.0555581068.

The spelling of 2199818 in words is "two million, one hundred ninety-nine thousand, eight hundred eighteen".