1664904 has 16 divisors (see below), whose sum is σ = 4162320. Its totient is φ = 554960.

The previous prime is 1664903. The next prime is 1664909. The reversal of 1664904 is 4094661.

It is not an unprimeable number, because it can be changed into a prime (1664903) 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, 34662 + ... + 34709.

It is an arithmetic number, because the mean of its divisors is an integer number (260145).

2^1664904 is an apocalyptic number.

It is an amenable number.

1664904 is an abundant number, since it is smaller than the sum of its proper divisors (2497416).

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

1664904 is a wasteful number, since it uses less digits than its factorization.

1664904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69380 (or 69376 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1664904 is about 1290.3115902758. The cubic root of 1664904 is about 118.5212979576.

The spelling of 1664904 in words is "one million, six hundred sixty-four thousand, nine hundred four".