818980 has 12 divisors (see below), whose sum is σ = 1719900. Its totient is φ = 327584.

The previous prime is 818977. The next prime is 818999. The reversal of 818980 is 89818.

It can be written as a sum of positive squares in 2 ways, for example, as 331776 + 487204 = 576^2 + 698^2 .

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 20455 + ... + 20494.

It is an arithmetic number, because the mean of its divisors is an integer number (143325).

2⁸¹⁸⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

818980 is an abundant number, since it is smaller than the sum of its proper divisors (900920).

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

818980 is a wasteful number, since it uses less digits than its factorization.

818980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40958 (or 40956 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 818980 is about 904.9751377800. The cubic root of 818980 is about 93.5601907804.

The spelling of 818980 in words is "eight hundred eighteen thousand, nine hundred eighty".