1666973 has 8 divisors (see below), whose sum is σ = 2078400. Its totient is φ = 1298880.

The previous prime is 1666943. The next prime is 1666991. The reversal of 1666973 is 3796661.

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

It is not a de Polignac number, because 1666973 - 2⁶ = 1666909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10748 + ... + 10901.

It is an arithmetic number, because the mean of its divisors is an integer number (259800).

2^1666973 is an apocalyptic number.

It is an amenable number.

1666973 is a deficient number, since it is larger than the sum of its proper divisors (411427).

1666973 is a wasteful number, since it uses less digits than its factorization.

1666973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21667.

The product of its digits is 40824, while the sum is 38.

The square root of 1666973 is about 1291.1130856745. The cubic root of 1666973 is about 118.5703736712.

The spelling of 1666973 in words is "one million, six hundred sixty-six thousand, nine hundred seventy-three".