1666888 has 16 divisors (see below), whose sum is σ = 3150000. Its totient is φ = 826896.

The previous prime is 1666871. The next prime is 1666897. The reversal of 1666888 is 8886661.

It is a happy number.

It is a plaindrome in base 10.

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, 363 + ... + 1861.

It is an arithmetic number, because the mean of its divisors is an integer number (196875).

2^1666888 is an apocalyptic number.

It is an amenable number.

1666888 is a deficient number, since it is larger than the sum of its proper divisors (1483112).

1666888 is a wasteful number, since it uses less digits than its factorization.

1666888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1640 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 1666888 is about 1291.0801679214. The cubic root of 1666888 is about 118.5683583110.

The spelling of 1666888 in words is "one million, six hundred sixty-six thousand, eight hundred eighty-eight".