823530 has 32 divisors (see below), whose sum is σ = 2003904. Its totient is φ = 216576.

The previous prime is 823519. The next prime is 823541. The reversal of 823530 is 35328.

It is an interprime number because it is at equal distance from previous prime (823519) and next prime (823541).

It is a nialpdrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 823497 and 823506.

It is an unprimeable number.

823530 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, 2769 + ... + 3051.

It is an arithmetic number, because the mean of its divisors is an integer number (62622).

2⁸²³⁵³⁰ is an apocalyptic number.

823530 is an abundant number, since it is smaller than the sum of its proper divisors (1180374).

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

823530 is a wasteful number, since it uses less digits than its factorization.

823530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 823530 is about 907.4855370748. The cubic root of 823530 is about 93.7331347440.

Adding to 823530 its reverse (35328), we get a palindrome (858858).

The spelling of 823530 in words is "eight hundred twenty-three thousand, five hundred thirty".