1804989 has 8 divisors (see below), whose sum is σ = 2489760. Its totient is φ = 1161776.

The previous prime is 1804973. The next prime is 1804991. The reversal of 1804989 is 9894081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1804989 - 2⁴ = 1804973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804919) 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 7 ways as a sum of consecutive naturals, for example, 10287 + ... + 10460.

It is an arithmetic number, because the mean of its divisors is an integer number (311220).

2^1804989 is an apocalyptic number.

It is an amenable number.

1804989 is a deficient number, since it is larger than the sum of its proper divisors (684771).

1804989 is a wasteful number, since it uses less digits than its factorization.

1804989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20779.

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

The square root of 1804989 is about 1343.4987904721. The cubic root of 1804989 is about 121.7563218161.

The spelling of 1804989 in words is "one million, eight hundred four thousand, nine hundred eighty-nine".