1664975 has 24 divisors (see below), whose sum is σ = 2291520. Its totient is φ = 1192320.

The previous prime is 1664959. The next prime is 1664987. The reversal of 1664975 is 5794661.

It is not a de Polignac number, because 1664975 - 2⁴ = 1664959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15221 + ... + 15329.

It is an arithmetic number, because the mean of its divisors is an integer number (95480).

2^1664975 is an apocalyptic number.

1664975 is a deficient number, since it is larger than the sum of its proper divisors (626545).

1664975 is a wasteful number, since it uses less digits than its factorization.

1664975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 174 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 1664975 is about 1290.3391027168. The cubic root of 1664975 is about 118.5229827179.

The spelling of 1664975 in words is "one million, six hundred sixty-four thousand, nine hundred seventy-five".