1644604 has 12 divisors (see below), whose sum is σ = 3099544. Its totient is φ = 759024.

The previous prime is 1644593. The next prime is 1644607. The reversal of 1644604 is 4064461.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644607) 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, 15762 + ... + 15865.

2^1644604 is an apocalyptic number.

It is an amenable number.

1644604 is a deficient number, since it is larger than the sum of its proper divisors (1454940).

1644604 is a wasteful number, since it uses less digits than its factorization.

1644604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31644 (or 31642 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1644604 is about 1282.4211476734. The cubic root of 1644604 is about 118.0376208685.

The spelling of 1644604 in words is "one million, six hundred forty-four thousand, six hundred four".