1666288 has 20 divisors (see below), whose sum is σ = 3477208. Its totient is φ = 768960.

The previous prime is 1666279. The next prime is 1666297. The reversal of 1666288 is 8826661.

It is an interprime number because it is at equal distance from previous prime (1666279) and next prime (1666297).

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, 3798 + ... + 4213.

2^1666288 is an apocalyptic number.

It is an amenable number.

1666288 is an abundant number, since it is smaller than the sum of its proper divisors (1810920).

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

1666288 is a wasteful number, since it uses less digits than its factorization.

1666288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8032 (or 8026 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 1666288 is about 1290.8477834354. The cubic root of 1666288 is about 118.5541302900.

The spelling of 1666288 in words is "one million, six hundred sixty-six thousand, two hundred eighty-eight".