800990 has 16 divisors (see below), whose sum is σ = 1453248. Its totient is φ = 317856.

The previous prime is 800977. The next prime is 800993. The reversal of 800990 is 99008.

It is a happy number.

800990 is a modest number, since divided by 990 gives 80 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800993) by changing a digit.

800990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 1499 + ... + 1961.

It is an arithmetic number, because the mean of its divisors is an integer number (90828).

2⁸⁰⁰⁹⁹⁰ is an apocalyptic number.

800990 is a deficient number, since it is larger than the sum of its proper divisors (652258).

800990 is a wasteful number, since it uses less digits than its factorization.

800990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 800990 is about 894.9804467138. The cubic root of 800990 is about 92.8700539951.

Adding to 800990 its reverse (99008), we get a palindrome (899998).

The spelling of 800990 in words is "eight hundred thousand, nine hundred ninety".