823989 has 8 divisors (see below), whose sum is σ = 1103200. Its totient is φ = 547056.

The previous prime is 823981. The next prime is 823993. The reversal of 823989 is 989328.

823989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 823989 - 2³ = 823981 is a prime.

It is a super-3 number, since 3×823989³ = 1678361454273332007, which contains 333 as substring.

It is a d-powerful number, because it can be written as 8² + 2¹⁸ + 9⁴ + 3⁹ + 8⁴ + 9⁶ .

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (137900).

2⁸²³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

823989 is a deficient number, since it is larger than the sum of its proper divisors (279211).

823989 is a wasteful number, since it uses less digits than its factorization.

823989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139.

The product of its digits is 31104, while the sum is 39.

The square root of 823989 is about 907.7383984387. The cubic root of 823989 is about 93.7505457746.

The spelling of 823989 in words is "eight hundred twenty-three thousand, nine hundred eighty-nine".