823040 has 36 divisors (see below), whose sum is σ = 1974504. Its totient is φ = 328704.

The previous prime is 823033. The next prime is 823051. The reversal of 823040 is 40328.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959 + ... + 1601.

2⁸²³⁰⁴⁰ is an apocalyptic number.

823040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 823040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987252).

823040 is an abundant number, since it is smaller than the sum of its proper divisors (1151464).

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

823040 is an equidigital number, since it uses as much as digits as its factorization.

823040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 823040 is about 907.2155201494. The cubic root of 823040 is about 93.7145406639.

Adding to 823040 its reverse (40328), we get a palindrome (863368).

The spelling of 823040 in words is "eight hundred twenty-three thousand, forty".