1320631940 has 48 divisors (see below), whose sum is σ = 2930618880. Its totient is φ = 498875520.

The previous prime is 1320631937. The next prime is 1320631969. The reversal of 1320631940 is 491360231.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18170 + ... + 54510.

It is an arithmetic number, because the mean of its divisors is an integer number (61054560).

Almost surely, 2^1320631940 is an apocalyptic number.

1320631940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 36340×36341.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320631940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1465309440).

1320631940 is an abundant number, since it is smaller than the sum of its proper divisors (1609986940).

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

1320631940 is a wasteful number, since it uses less digits than its factorization.

1320631940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36452 (or 36450 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1320631940 is about 36340.4999965603. The cubic root of 1320631940 is about 1097.1363365311.

The spelling of 1320631940 in words is "one billion, three hundred twenty million, six hundred thirty-one thousand, nine hundred forty".