1804840 has 16 divisors (see below), whose sum is σ = 4060980. Its totient is φ = 721920.

The previous prime is 1804819. The next prime is 1804841. The reversal of 1804840 is 484081.

It can be written as a sum of positive squares in 2 ways, for example, as 1572516 + 232324 = 1254^2 + 482^2 .

It is not an unprimeable number, because it can be changed into a prime (1804841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22521 + ... + 22600.

2^1804840 is an apocalyptic number.

1804840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1804840 is an abundant number, since it is smaller than the sum of its proper divisors (2256140).

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

1804840 is a wasteful number, since it uses less digits than its factorization.

1804840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45132 (or 45128 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 1804840 is about 1343.4433371006. The cubic root of 1804840 is about 121.7529714372.

The spelling of 1804840 in words is "one million, eight hundred four thousand, eight hundred forty".