2166898 has 4 divisors (see below), whose sum is σ = 3250350. Its totient is φ = 1083448.

The previous prime is 2166877. The next prime is 2166917. The reversal of 2166898 is 8986612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1172889 + 994009 = 1083^2 + 997^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166898.

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 as a sum of consecutive naturals, namely, 541723 + ... + 541726.

2^2166898 is an apocalyptic number.

2166898 is a deficient number, since it is larger than the sum of its proper divisors (1083452).

2166898 is a wasteful number, since it uses less digits than its factorization.

2166898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083451.

The product of its digits is 41472, while the sum is 40.

The square root of 2166898 is about 1472.0387223168. The cubic root of 2166898 is about 129.4035397220.

The spelling of 2166898 in words is "two million, one hundred sixty-six thousand, eight hundred ninety-eight".