1664103 has 16 divisors (see below), whose sum is σ = 2562560. Its totient is φ = 940896.

The previous prime is 1664101. The next prime is 1664123. The reversal of 1664103 is 3014661.

It is not a de Polignac number, because 1664103 - 2¹ = 1664101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1926 + ... + 2652.

It is an arithmetic number, because the mean of its divisors is an integer number (160160).

2^1664103 is an apocalyptic number.

1664103 is a deficient number, since it is larger than the sum of its proper divisors (898457).

1664103 is a wasteful number, since it uses less digits than its factorization.

1664103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1664103 is about 1290.0011627902. The cubic root of 1664103 is about 118.5022876946.

Adding to 1664103 its reverse (3014661), we get a palindrome (4678764).

The spelling of 1664103 in words is "one million, six hundred sixty-four thousand, one hundred three".