1804005 has 64 divisors (see below), whose sum is σ = 3870720. Its totient is φ = 779328.

The previous prime is 1803973. The next prime is 1804007. The reversal of 1804005 is 5004081.

It is not a de Polignac number, because 1804005 - 2⁵ = 1803973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21694 + ... + 21776.

It is an arithmetic number, because the mean of its divisors is an integer number (60480).

2^1804005 is an apocalyptic number.

1804005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1804005 is an abundant number, since it is smaller than the sum of its proper divisors (2066715).

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

1804005 is a wasteful number, since it uses less digits than its factorization.

1804005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1804005 is about 1343.1325325522. The cubic root of 1804005 is about 121.7341924110.

Adding to 1804005 its reverse (5004081), we get a palindrome (6808086).

The spelling of 1804005 in words is "one million, eight hundred four thousand, five".