1143979320 has 256 divisors, whose sum is σ = 3920140800. Its totient is φ = 264591360.

The previous prime is 1143979301. The next prime is 1143979349. The reversal of 1143979320 is 239793411.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2881362 + ... + 2881758.

It is an arithmetic number, because the mean of its divisors is an integer number (15313050).

Almost surely, 2^1143979320 is an apocalyptic number.

1143979320 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 1143979320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1960070400).

1143979320 is an abundant number, since it is smaller than the sum of its proper divisors (2776161480).

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

1143979320 is a wasteful number, since it uses less digits than its factorization.

1143979320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 1143979320 is about 33822.7633406852. The cubic root of 1143979320 is about 1045.8580043104.

The spelling of 1143979320 in words is "one billion, one hundred forty-three million, nine hundred seventy-nine thousand, three hundred twenty".