1329731320 has 16 divisors (see below), whose sum is σ = 2991895560. Its totient is φ = 531892512.

The previous prime is 1329731317. The next prime is 1329731327. The reversal of 1329731320 is 231379231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329731327) 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, 16621602 + ... + 16621681.

Almost surely, 2^1329731320 is an apocalyptic number.

1329731320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1329731320 is an abundant number, since it is smaller than the sum of its proper divisors (1662164240).

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

1329731320 is a wasteful number, since it uses less digits than its factorization.

1329731320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33243294 (or 33243290 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 1329731320 is about 36465.4812116884. The cubic root of 1329731320 is about 1099.6503902738.

The spelling of 1329731320 in words is "one billion, three hundred twenty-nine million, seven hundred thirty-one thousand, three hundred twenty".