823240 has 32 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 299200.

The previous prime is 823237. The next prime is 823241. The reversal of 823240 is 42328.

It is a happy number.

823240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (823241) 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, 496 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (63180).

2⁸²³²⁴⁰ is an apocalyptic number.

It is an amenable number.

823240 is an abundant number, since it is smaller than the sum of its proper divisors (1198520).

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

823240 is a wasteful number, since it uses less digits than its factorization.

823240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893 (or 1889 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 823240 is about 907.3257408450. The cubic root of 823240 is about 93.7221309755.

Adding to 823240 its reverse (42328), we get a palindrome (865568).

The spelling of 823240 in words is "eight hundred twenty-three thousand, two hundred forty".