812180 has 12 divisors (see below), whose sum is σ = 1705620. Its totient is φ = 324864.

The previous prime is 812179. The next prime is 812183. The reversal of 812180 is 81218.

It can be written as a sum of positive squares in 2 ways, for example, as 228484 + 583696 = 478^2 + 764^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 40609 = 812180 / (8 + 1 + 2 + 1 + 8 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20285 + ... + 20324.

It is an arithmetic number, because the mean of its divisors is an integer number (142135).

2⁸¹²¹⁸⁰ is an apocalyptic number.

It is an amenable number.

812180 is an abundant number, since it is smaller than the sum of its proper divisors (893440).

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

812180 is a wasteful number, since it uses less digits than its factorization.

812180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40618 (or 40616 counting only the distinct ones).

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

The square root of 812180 is about 901.2102973224. The cubic root of 812180 is about 93.3005270188.

Adding to 812180 its reverse (81218), we get a palindrome (893398).

The spelling of 812180 in words is "eight hundred twelve thousand, one hundred eighty".