821180 has 24 divisors (see below), whose sum is σ = 1816080. Its totient is φ = 311040.

The previous prime is 821173. The next prime is 821207. The reversal of 821180 is 81128.

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

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 701 + ... + 1460.

It is an arithmetic number, because the mean of its divisors is an integer number (75670).

2⁸²¹¹⁸⁰ is an apocalyptic number.

It is an amenable number.

821180 is an abundant number, since it is smaller than the sum of its proper divisors (994900).

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

821180 is a wasteful number, since it uses less digits than its factorization.

821180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189 (or 2187 counting only the distinct ones).

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

The square root of 821180 is about 906.1898255884. The cubic root of 821180 is about 93.6438918017.

It can be divided in two parts, 821 and 180, that added together give a palindrome (1001).

The spelling of 821180 in words is "eight hundred twenty-one thousand, one hundred eighty".