1804998 has 32 divisors (see below), whose sum is σ = 3953376. Its totient is φ = 546048.

The previous prime is 1804997. The next prime is 1805003. The reversal of 1804998 is 8994081.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5536 + ... + 5852.

It is an arithmetic number, because the mean of its divisors is an integer number (123543).

2^1804998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1804998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1976688).

1804998 is an abundant number, since it is smaller than the sum of its proper divisors (2148378).

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

1804998 is a wasteful number, since it uses less digits than its factorization.

1804998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1804998 is about 1343.5021399313. The cubic root of 1804998 is about 121.7565241821.

The spelling of 1804998 in words is "one million, eight hundred four thousand, nine hundred ninety-eight".