823740 has 24 divisors (see below), whose sum is σ = 2306640. Its totient is φ = 219648.

The previous prime is 823729. The next prime is 823741. The reversal of 823740 is 47328.

823740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 823740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823741) by changing a digit.

823740 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 7 ways as a sum of consecutive naturals, for example, 6805 + ... + 6924.

It is an arithmetic number, because the mean of its divisors is an integer number (96110).

2⁸²³⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

823740 is an abundant number, since it is smaller than the sum of its proper divisors (1482900).

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

823740 is a wasteful number, since it uses less digits than its factorization.

823740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13741 (or 13739 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 823740 is about 907.6012340230. The cubic root of 823740 is about 93.7411013776.

The spelling of 823740 in words is "eight hundred twenty-three thousand, seven hundred forty".