823218140 has 24 divisors (see below), whose sum is σ = 1744622880. Its totient is φ = 326265408.

The previous prime is 823218133. The next prime is 823218161. The reversal of 823218140 is 41812328.

823218140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186632 + ... + 190991.

It is an arithmetic number, because the mean of its divisors is an integer number (72692620).

Almost surely, 2^823218140 is an apocalyptic number.

It is an amenable number.

823218140 is an abundant number, since it is smaller than the sum of its proper divisors (921404740).

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

823218140 is a wasteful number, since it uses less digits than its factorization.

823218140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377741 (or 377739 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 823218140 is about 28691.7782648619. The cubic root of 823218140 is about 937.2130141425.

The spelling of 823218140 in words is "eight hundred twenty-three million, two hundred eighteen thousand, one hundred forty".