1604004 has 24 divisors (see below), whose sum is σ = 3763200. Its totient is φ = 531744.

The previous prime is 1604003. The next prime is 1604017. The reversal of 1604004 is 4004061.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1604003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3997 + ... + 4379.

It is an arithmetic number, because the mean of its divisors is an integer number (156800).

2^1604004 is an apocalyptic number.

It is an amenable number.

1604004 is an abundant number, since it is smaller than the sum of its proper divisors (2159196).

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

1604004 is a wasteful number, since it uses less digits than its factorization.

1604004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1604004 is about 1266.4927950841. The cubic root of 1604004 is about 117.0581929814.

Adding to 1604004 its reverse (4004061), we get a palindrome (5608065).

The spelling of 1604004 in words is "one million, six hundred four thousand, four".