2001604 has 12 divisors (see below), whose sum is σ = 3821328. Its totient is φ = 909800.

The previous prime is 2001583. The next prime is 2001611. The reversal of 2001604 is 4061002.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22702 + ... + 22789.

It is an arithmetic number, because the mean of its divisors is an integer number (318444).

2^2001604 is an apocalyptic number.

It is an amenable number.

2001604 is a deficient number, since it is larger than the sum of its proper divisors (1819724).

2001604 is a wasteful number, since it uses less digits than its factorization.

2001604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45506 (or 45504 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2001604 is about 1414.7805483537. The cubic root of 2001604 is about 126.0257778786.

Adding to 2001604 its reverse (4061002), we get a palindrome (6062606).

The spelling of 2001604 in words is "two million, one thousand, six hundred four".