823980 has 48 divisors (see below), whose sum is σ = 2386944. Its totient is φ = 212160.

The previous prime is 823969. The next prime is 823981. The reversal of 823980 is 89328.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (823981) by changing a digit.

823980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1639 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (49728).

2⁸²³⁹⁸⁰ 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 823980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1193472).

823980 is an abundant number, since it is smaller than the sum of its proper divisors (1562964).

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

823980 is a wasteful number, since it uses less digits than its factorization.

823980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 823980 is about 907.7334410497. The cubic root of 823980 is about 93.7502044440.

The spelling of 823980 in words is "eight hundred twenty-three thousand, nine hundred eighty".