1143111440 has 80 divisors (see below), whose sum is σ = 2857317120. Its totient is φ = 423936000.

The previous prime is 1143111439. The next prime is 1143111457. The reversal of 1143111440 is 441113411.

It is a tau number, because it is divible by the number of its divisors (80).

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, 63440 + ... + 79440.

It is an arithmetic number, because the mean of its divisors is an integer number (35716464).

Almost surely, 2^1143111440 is an apocalyptic number.

1143111440 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 1143111440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428658560).

1143111440 is an abundant number, since it is smaller than the sum of its proper divisors (1714205680).

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

1143111440 is a wasteful number, since it uses less digits than its factorization.

1143111440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16080 (or 16074 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1143111440 is about 33809.9310854074. The cubic root of 1143111440 is about 1045.5934573141.

Adding to 1143111440 its reverse (441113411), we get a palindrome (1584224851).

The spelling of 1143111440 in words is "one billion, one hundred forty-three million, one hundred eleven thousand, four hundred forty".