1320739992 has 192 divisors, whose sum is σ = 4358914560. Its totient is φ = 369360000.

The previous prime is 1320739967. The next prime is 1320739999. The reversal of 1320739992 is 2999370231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320739999) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 275617 + ... + 280367.

It is an arithmetic number, because the mean of its divisors is an integer number (22702680).

Almost surely, 2^1320739992 is an apocalyptic number.

1320739992 is a gapful number since it is divisible by the number (12) 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 1320739992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2179457280).

1320739992 is an abundant number, since it is smaller than the sum of its proper divisors (3038174568).

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

1320739992 is a wasteful number, since it uses less digits than its factorization.

1320739992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4796 (or 4780 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 1320739992 is about 36341.9866270406. The cubic root of 1320739992 is about 1097.1662576970.

The spelling of 1320739992 in words is "one billion, three hundred twenty million, seven hundred thirty-nine thousand, nine hundred ninety-two".