1918866 has 8 divisors (see below), whose sum is σ = 3837744. Its totient is φ = 639620.

The previous prime is 1918859. The next prime is 1918879. The reversal of 1918866 is 6688191.

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

1918866 is an admirable number.

It is an Ulam number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 159900 + ... + 159911.

It is an arithmetic number, because the mean of its divisors is an integer number (479718).

2^1918866 is an apocalyptic number.

1918866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1918866 is a wasteful number, since it uses less digits than its factorization.

1918866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319816.

The product of its digits is 20736, while the sum is 39.

The square root of 1918866 is about 1385.2313886135. The cubic root of 1918866 is about 124.2648259632.

The spelling of 1918866 in words is "one million, nine hundred eighteen thousand, eight hundred sixty-six".