1804842 has 40 divisors (see below), whose sum is σ = 4360356. Its totient is φ = 554688.

The previous prime is 1804841. The next prime is 1804871. The reversal of 1804842 is 2484081.

1804842 is a `hidden beast` number, since 180 + 484 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1798281 + 6561 = 1341^2 + 81^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 1678 + ... + 2534.

2^1804842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1804842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2180178).

1804842 is an abundant number, since it is smaller than the sum of its proper divisors (2555514).

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

1804842 is a wasteful number, since it uses less digits than its factorization.

1804842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 1804842 is about 1343.4440814563. Note that the first 3 decimals coincide. The cubic root of 1804842 is about 121.7530164100.

The spelling of 1804842 in words is "one million, eight hundred four thousand, eight hundred forty-two".