1323204520 has 64 divisors (see below), whose sum is σ = 3438936000. Its totient is φ = 452858880.

The previous prime is 1323204473. The next prime is 1323204529. The reversal of 1323204520 is 254023231.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1323204491 and 1323204500.

It is not an unprimeable number, because it can be changed into a prime (1323204529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80970 + ... + 95929.

It is an arithmetic number, because the mean of its divisors is an integer number (53733375).

Almost surely, 2^1323204520 is an apocalyptic number.

1323204520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323204520 is an abundant number, since it is smaller than the sum of its proper divisors (2115731480).

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

1323204520 is a wasteful number, since it uses less digits than its factorization.

1323204520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176938 (or 176934 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 1323204520 is about 36375.8782711841. The cubic root of 1323204520 is about 1097.8482785883.

Adding to 1323204520 its reverse (254023231), we get a palindrome (1577227751).

The spelling of 1323204520 in words is "one billion, three hundred twenty-three million, two hundred four thousand, five hundred twenty".