1664004 has 24 divisors (see below), whose sum is σ = 4052160. Its totient is φ = 530464.

The previous prime is 1663997. The next prime is 1664009. The reversal of 1664004 is 4004661.

It is not an unprimeable number, because it can be changed into a prime (1664009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2739 + ... + 3290.

It is an arithmetic number, because the mean of its divisors is an integer number (168840).

2^1664004 is an apocalyptic number.

It is an amenable number.

1664004 is an abundant number, since it is smaller than the sum of its proper divisors (2388156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664004 is a wasteful number, since it uses less digits than its factorization.

1664004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6059 (or 6057 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1664004 is about 1289.9627901610. The cubic root of 1664004 is about 118.4999376880.

Adding to 1664004 its reverse (4004661), we get a palindrome (5668665).

The spelling of 1664004 in words is "one million, six hundred sixty-four thousand, four".