1321839120 has 160 divisors (see below), whose sum is σ = 4929684480. Its totient is φ = 286225920.

The previous prime is 1321839109. The next prime is 1321839149. The reversal of 1321839120 is 219381231.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11215 + ... + 52625.

It is an arithmetic number, because the mean of its divisors is an integer number (30810528).

Almost surely, 2^1321839120 is an apocalyptic number.

1321839120 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 1321839120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2464842240).

1321839120 is an abundant number, since it is smaller than the sum of its proper divisors (3607845360).

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

1321839120 is a wasteful number, since it uses less digits than its factorization.

1321839120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41453 (or 41447 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1321839120 is about 36357.1054953499. The cubic root of 1321839120 is about 1097.4705294916.

The spelling of 1321839120 in words is "one billion, three hundred twenty-one million, eight hundred thirty-nine thousand, one hundred twenty".