1666604 has 12 divisors (see below), whose sum is σ = 3070200. Its totient is φ = 789408.

The previous prime is 1666597. The next prime is 1666607. The reversal of 1666604 is 4066661.

It is not an unprimeable number, because it can be changed into a prime (1666607) 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 3 ways as a sum of consecutive naturals, for example, 10889 + ... + 11040.

It is an arithmetic number, because the mean of its divisors is an integer number (255850).

2^1666604 is an apocalyptic number.

It is an amenable number.

1666604 is a deficient number, since it is larger than the sum of its proper divisors (1403596).

1666604 is a wasteful number, since it uses less digits than its factorization.

1666604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21952 (or 21950 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1666604 is about 1290.9701778120. The cubic root of 1666604 is about 118.5616241401.

The spelling of 1666604 in words is "one million, six hundred sixty-six thousand, six hundred four".