823509140 has 24 divisors (see below), whose sum is σ = 1730031072. Its totient is φ = 329277600.

The previous prime is 823509119. The next prime is 823509161. The reversal of 823509140 is 41905328.

It is an interprime number because it is at equal distance from previous prime (823509119) and next prime (823509161).

It is a junction number, because it is equal to n+sod(n) for n = 823509097 and 823509106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59915 + ... + 72365.

It is an arithmetic number, because the mean of its divisors is an integer number (72084628).

Almost surely, 2^823509140 is an apocalyptic number.

It is an amenable number.

823509140 is an abundant number, since it is smaller than the sum of its proper divisors (906521932).

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

823509140 is a wasteful number, since it uses less digits than its factorization.

823509140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15767 (or 15765 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 823509140 is about 28696.8489559394. The cubic root of 823509140 is about 937.3234331775.

The spelling of 823509140 in words is "eight hundred twenty-three million, five hundred nine thousand, one hundred forty".