1816866 has 12 divisors (see below), whose sum is σ = 3936582. Its totient is φ = 605616.

The previous prime is 1816861. The next prime is 1816901. The reversal of 1816866 is 6686181.

It can be written as a sum of positive squares in only one way, i.e., 1766241 + 50625 = 1329^2 + 225^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1816866.

It is not an unprimeable number, because it can be changed into a prime (1816861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50451 + ... + 50486.

2^1816866 is an apocalyptic number.

1816866 is an abundant number, since it is smaller than the sum of its proper divisors (2119716).

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

1816866 is a wasteful number, since it uses less digits than its factorization.

1816866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100945 (or 100942 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1816866 is about 1347.9117181774. The cubic root of 1816866 is about 122.0227942718.

The spelling of 1816866 in words is "one million, eight hundred sixteen thousand, eight hundred sixty-six".