1643604 has 24 divisors (see below), whose sum is σ = 3968160. Its totient is φ = 528864.

The previous prime is 1643599. The next prime is 1643617. The reversal of 1643604 is 4063461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2014 + ... + 2709.

It is an arithmetic number, because the mean of its divisors is an integer number (165340).

2^1643604 is an apocalyptic number.

It is an amenable number.

1643604 is an abundant number, since it is smaller than the sum of its proper divisors (2324556).

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

1643604 is a wasteful number, since it uses less digits than its factorization.

1643604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4759 (or 4757 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1643604 is about 1282.0312008684. The cubic root of 1643604 is about 118.0136917944.

The spelling of 1643604 in words is "one million, six hundred forty-three thousand, six hundred four".