1143285440 has 84 divisors (see below), whose sum is σ = 2992544688. Its totient is φ = 415726080.

The previous prime is 1143285439. The next prime is 1143285463. The reversal of 1143285440 is 445823411.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1143285397 and 1143285406.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23957 + ... + 53483.

It is an arithmetic number, because the mean of its divisors is an integer number (35625532).

Almost surely, 2^1143285440 is an apocalyptic number.

1143285440 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 1143285440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1496272344).

1143285440 is an abundant number, since it is smaller than the sum of its proper divisors (1849259248).

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

1143285440 is a wasteful number, since it uses less digits than its factorization.

1143285440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29566 (or 29545 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 1143285440 is about 33812.5041959332. The cubic root of 1143285440 is about 1045.6465066859.

The spelling of 1143285440 in words is "one billion, one hundred forty-three million, two hundred eighty-five thousand, four hundred forty".