1323645520 has 40 divisors (see below), whose sum is σ = 3079211400. Its totient is φ = 529159680.

The previous prime is 1323645509. The next prime is 1323645539. The reversal of 1323645520 is 255463231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31674384 + 1291971136 = 5628^2 + 35944^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 187006 + ... + 193954.

It is an arithmetic number, because the mean of its divisors is an integer number (76980285).

Almost surely, 2^1323645520 is an apocalyptic number.

1323645520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323645520 is an abundant number, since it is smaller than the sum of its proper divisors (1755565880).

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

1323645520 is a wasteful number, since it uses less digits than its factorization.

1323645520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9343 (or 9337 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 1323645520 is about 36381.9394755145. The cubic root of 1323645520 is about 1097.9702293292.

The spelling of 1323645520 in words is "one billion, three hundred twenty-three million, six hundred forty-five thousand, five hundred twenty".