1001604 has 48 divisors (see below), whose sum is σ = 2580480. Its totient is φ = 300960.

The previous prime is 1001593. The next prime is 1001621. The reversal of 1001604 is 4061001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1001604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5149 + ... + 5339.

It is an arithmetic number, because the mean of its divisors is an integer number (53760).

2^1001604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1290240).

1001604 is an abundant number, since it is smaller than the sum of its proper divisors (1578876).

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

1001604 is a wasteful number, since it uses less digits than its factorization.

1001604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1001604 is about 1000.8016786557. The cubic root of 1001604 is about 100.0534381053.

Adding to 1001604 its reverse (4061001), we get a palindrome (5062605).

The spelling of 1001604 in words is "one million, one thousand, six hundred four".