818120 has 32 divisors (see below), whose sum is σ = 1867320. Its totient is φ = 322560.

The previous prime is 818113. The next prime is 818123. The reversal of 818120 is 21818.

It can be written as a sum of positive squares in 4 ways, for example, as 148996 + 669124 = 386^2 + 818^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 818092 and 818101.

It is not an unprimeable number, because it can be changed into a prime (818123) by changing a digit.

818120 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, 4430 + ... + 4610.

2⁸¹⁸¹²⁰ is an apocalyptic number.

It is a pronic number, being equal to 904×905.

It is an amenable number.

818120 is an abundant number, since it is smaller than the sum of its proper divisors (1049200).

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

818120 is a wasteful number, since it uses less digits than its factorization.

818120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 818120 is about 904.4998618021. The cubic root of 818120 is about 93.5274305402.

Adding to 818120 its reverse (21818), we get a palindrome (839938).

The spelling of 818120 in words is "eight hundred eighteen thousand, one hundred twenty".