1664594 has 4 divisors (see below), whose sum is σ = 2496894. Its totient is φ = 832296.

The previous prime is 1664569. The next prime is 1664627. The reversal of 1664594 is 4954661.

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

It can be written as a sum of positive squares in only one way, i.e., 1181569 + 483025 = 1087^2 + 695^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416147 + ... + 416150.

2^1664594 is an apocalyptic number.

1664594 is a deficient number, since it is larger than the sum of its proper divisors (832300).

1664594 is an equidigital number, since it uses as much as digits as its factorization.

1664594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832299.

The product of its digits is 25920, while the sum is 35.

The square root of 1664594 is about 1290.1914586603. The cubic root of 1664594 is about 118.5139414007.

The spelling of 1664594 in words is "one million, six hundred sixty-four thousand, five hundred ninety-four".