1805998 has 8 divisors (see below), whose sum is σ = 2796480. Its totient is φ = 873840.

The previous prime is 1805989. The next prime is 1806001. The reversal of 1805998 is 8995081.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1805998.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 14503 + ... + 14626.

It is an arithmetic number, because the mean of its divisors is an integer number (349560).

2^1805998 is an apocalyptic number.

1805998 is a deficient number, since it is larger than the sum of its proper divisors (990482).

1805998 is a wasteful number, since it uses less digits than its factorization.

1805998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29162.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1805998 is about 1343.8742500696. The cubic root of 1805998 is about 121.7790051020.

The spelling of 1805998 in words is "one million, eight hundred five thousand, nine hundred ninety-eight".