1604666 has 16 divisors (see below), whose sum is σ = 2797440. Its totient is φ = 676080.

The previous prime is 1604651. The next prime is 1604711. The reversal of 1604666 is 6664061.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 86 + ... + 1793.

It is an arithmetic number, because the mean of its divisors is an integer number (174840).

2^1604666 is an apocalyptic number.

1604666 is a deficient number, since it is larger than the sum of its proper divisors (1192774).

1604666 is a wasteful number, since it uses less digits than its factorization.

1604666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949.

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

The square root of 1604666 is about 1266.7541197881. The cubic root of 1604666 is about 117.0742947421.

The spelling of 1604666 in words is "one million, six hundred four thousand, six hundred sixty-six".