1664193 has 4 divisors (see below), whose sum is σ = 2218928. Its totient is φ = 1109460.

The previous prime is 1664123. The next prime is 1664227. The reversal of 1664193 is 3914661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3914661 = 3 ⋅1304887.

It is not a de Polignac number, because 1664193 - 2⁹ = 1663681 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

1664193 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664193.

It is not an unprimeable number, because it can be changed into a prime (1664123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277363 + ... + 277368.

It is an arithmetic number, because the mean of its divisors is an integer number (554732).

2^1664193 is an apocalyptic number.

It is an amenable number.

1664193 is a deficient number, since it is larger than the sum of its proper divisors (554735).

1664193 is an equidigital number, since it uses as much as digits as its factorization.

1664193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554734.

The product of its digits is 3888, while the sum is 30.

The square root of 1664193 is about 1290.0360460080. The cubic root of 1664193 is about 118.5044239834.

The spelling of 1664193 in words is "one million, six hundred sixty-four thousand, one hundred ninety-three".