1664875 has 16 divisors (see below), whose sum is σ = 2190240. Its totient is φ = 1260000.

The previous prime is 1664869. The next prime is 1664893. The reversal of 1664875 is 5784661.

It is not a de Polignac number, because 1664875 - 2³ = 1664867 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2025 + ... + 2725.

It is an arithmetic number, because the mean of its divisors is an integer number (136890).

2^1664875 is an apocalyptic number.

1664875 is a deficient number, since it is larger than the sum of its proper divisors (525365).

1664875 is an equidigital number, since it uses as much as digits as its factorization.

1664875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 725 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 1664875 is about 1290.3003526311. The cubic root of 1664875 is about 118.5206098023.

It can be divided in two parts, 166 and 4875, that added together give a square (5041 = 71²).

The spelling of 1664875 in words is "one million, six hundred sixty-four thousand, eight hundred seventy-five".