1804990 has 32 divisors (see below), whose sum is σ = 3615840. Its totient is φ = 643200.

The previous prime is 1804973. The next prime is 1804991. The reversal of 1804990 is 994081.

It is an Ulam 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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6576 + ... + 6844.

It is an arithmetic number, because the mean of its divisors is an integer number (112995).

2^1804990 is an apocalyptic number.

1804990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1804990 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

1804990 is a wasteful number, since it uses less digits than its factorization.

1804990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1804990 is about 1343.4991626346. The cubic root of 1804990 is about 121.7563443013.

The spelling of 1804990 in words is "one million, eight hundred four thousand, nine hundred ninety".