1320327840 has 192 divisors, whose sum is σ = 4498454016. Its totient is φ = 323592192.

The previous prime is 1320327823. The next prime is 1320327847. The reversal of 1320327840 is 487230231.

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

It is a junction number, because it is equal to n+sod(n) for n = 1320327798 and 1320327807.

It is not an unprimeable number, because it can be changed into a prime (1320327847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2851449 + ... + 2851911.

It is an arithmetic number, because the mean of its divisors is an integer number (23429448).

Almost surely, 2^1320327840 is an apocalyptic number.

1320327840 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 1320327840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2249227008).

1320327840 is an abundant number, since it is smaller than the sum of its proper divisors (3178126176).

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

1320327840 is a wasteful number, since it uses less digits than its factorization.

1320327840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 1320327840 is about 36336.3157185755. The cubic root of 1320327840 is about 1097.0521180692.

The spelling of 1320327840 in words is "one billion, three hundred twenty million, three hundred twenty-seven thousand, eight hundred forty".