1143231140 has 48 divisors (see below), whose sum is σ = 2547148800. Its totient is φ = 429795072.

The previous prime is 1143231091. The next prime is 1143231163. The reversal of 1143231140 is 411323411.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36416 + ... + 60104.

It is an arithmetic number, because the mean of its divisors is an integer number (53065600).

Almost surely, 2^1143231140 is an apocalyptic number.

1143231140 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 1143231140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273574400).

1143231140 is an abundant number, since it is smaller than the sum of its proper divisors (1403917660).

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

1143231140 is a wasteful number, since it uses less digits than its factorization.

1143231140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23844 (or 23842 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1143231140 is about 33811.7012290124. The cubic root of 1143231140 is about 1045.6299522011.

Adding to 1143231140 its reverse (411323411), we get a palindrome (1554554551).

The spelling of 1143231140 in words is "one billion, one hundred forty-three million, two hundred thirty-one thousand, one hundred forty".