823147540 has 12 divisors (see below), whose sum is σ = 1728609876. Its totient is φ = 329259008.

The previous prime is 823147511. The next prime is 823147541. The reversal of 823147540 is 45741328.

It can be written as a sum of positive squares in 2 ways, for example, as 560837124 + 262310416 = 23682^2 + 16196^2 .

It is a junction number, because it is equal to n+sod(n) for n = 823147496 and 823147505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823147541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20578669 + ... + 20578708.

It is an arithmetic number, because the mean of its divisors is an integer number (144050823).

Almost surely, 2^823147540 is an apocalyptic number.

It is an amenable number.

823147540 is an abundant number, since it is smaller than the sum of its proper divisors (905462336).

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

823147540 is a wasteful number, since it uses less digits than its factorization.

823147540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41157386 (or 41157384 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 823147540 is about 28690.5479208746. The cubic root of 823147540 is about 937.1862212723.

Adding to 823147540 its reverse (45741328), we get a palindrome (868888868).

The spelling of 823147540 in words is "eight hundred twenty-three million, one hundred forty-seven thousand, five hundred forty".