1809868 has 12 divisors (see below), whose sum is σ = 3183040. Its totient is φ = 900432.

The previous prime is 1809859. The next prime is 1809881. The reversal of 1809868 is 8689081.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1809868.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123 + ... + 1906.

2^1809868 is an apocalyptic number.

It is an amenable number.

1809868 is a deficient number, since it is larger than the sum of its proper divisors (1373172).

1809868 is a wasteful number, since it uses less digits than its factorization.

1809868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256 (or 2254 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 1809868 is about 1345.3133463993. The cubic root of 1809868 is about 121.8659281435.

The spelling of 1809868 in words is "one million, eight hundred nine thousand, eight hundred sixty-eight".