1323022520 has 64 divisors (see below), whose sum is σ = 3032821440. Its totient is φ = 519321600.

The previous prime is 1323022499. The next prime is 1323022531. The reversal of 1323022520 is 252203231.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1323022492 and 1323022501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 683474 + ... + 685406.

It is an arithmetic number, because the mean of its divisors is an integer number (47387835).

Almost surely, 2^1323022520 is an apocalyptic number.

1323022520 is a gapful number since it is divisible by the number (10) 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 1323022520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516410720).

1323022520 is an abundant number, since it is smaller than the sum of its proper divisors (1709798920).

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

1323022520 is a wasteful number, since it uses less digits than its factorization.

1323022520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256 (or 2252 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 1323022520 is about 36373.3765273448. The cubic root of 1323022520 is about 1097.7979418124.

Adding to 1323022520 its reverse (252203231), we get a palindrome (1575225751).

The spelling of 1323022520 in words is "one billion, three hundred twenty-three million, twenty-two thousand, five hundred twenty".