1666873 has 4 divisors (see below), whose sum is σ = 1795108. Its totient is φ = 1538640.

The previous prime is 1666871. The next prime is 1666897. The reversal of 1666873 is 3786661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 506944 + 1159929 = 712^2 + 1077^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666873 - 2¹ = 1666871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666871) by changing a digit.

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, 64098 + ... + 64123.

It is an arithmetic number, because the mean of its divisors is an integer number (448777).

2^1666873 is an apocalyptic number.

1666873 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1666873 is a deficient number, since it is larger than the sum of its proper divisors (128235).

1666873 is a wasteful number, since it uses less digits than its factorization.

1666873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128234.

The product of its digits is 36288, while the sum is 37.

The square root of 1666873 is about 1291.0743588190. The cubic root of 1666873 is about 118.5680026521.

The spelling of 1666873 in words is "one million, six hundred sixty-six thousand, eight hundred seventy-three".