818100 has 90 divisors (see below), whose sum is σ = 2678214. Its totient is φ = 216000.

The previous prime is 818099. The next prime is 818101. The reversal of 818100 is 1818.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (818099) and next prime (818101).

It can be written as a sum of positive squares in 3 ways, for example, as 219024 + 599076 = 468^2 + 774^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a super-2 number, since 2×818100² = 1338575220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818101) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 8050 + ... + 8150.

2⁸¹⁸¹⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339107).

818100 is an abundant number, since it is smaller than the sum of its proper divisors (1860114).

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

818100 is a wasteful number, since it uses less digits than its factorization.

818100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 818100 is about 904.4888059009. The cubic root of 818100 is about 93.5266684011.

Adding to 818100 its reverse (1818), we get a palindrome (819918).

It can be divided in two parts, 81 and 8100, that multiplied together give a square (656100 = 810²).

The spelling of 818100 in words is "eight hundred eighteen thousand, one hundred".