1666228 has 12 divisors (see below), whose sum is σ = 2957472. Its totient is φ = 821240.

The previous prime is 1666213. The next prime is 1666237. The reversal of 1666228 is 8226661.

It is a self number, because there is not a number n which added to its sum of digits gives 1666228.

It is a congruent 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, 2650 + ... + 3217.

It is an arithmetic number, because the mean of its divisors is an integer number (246456).

2^1666228 is an apocalyptic number.

It is an amenable number.

1666228 is a deficient number, since it is larger than the sum of its proper divisors (1291244).

1666228 is a wasteful number, since it uses less digits than its factorization.

1666228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5942 (or 5940 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 1666228 is about 1290.8245426858. The cubic root of 1666228 is about 118.5527073001.

The spelling of 1666228 in words is "one million, six hundred sixty-six thousand, two hundred twenty-eight".