1143889985 has 8 divisors (see below), whose sum is σ = 1568763456. Its totient is φ = 784381680.

The previous prime is 1143889979. The next prime is 1143889997. The reversal of 1143889985 is 5899883411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1143889985 - 2¹⁶ = 1143824449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1143889985.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16341251 + ... + 16341320.

It is an arithmetic number, because the mean of its divisors is an integer number (196095432).

Almost surely, 2^1143889985 is an apocalyptic number.

It is an amenable number.

1143889985 is a deficient number, since it is larger than the sum of its proper divisors (424873471).

1143889985 is an equidigital number, since it uses as much as digits as its factorization.

1143889985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32682583.

The product of its digits is 2488320, while the sum is 56.

The square root of 1143889985 is about 33821.4426806427. The cubic root of 1143889985 is about 1045.8307794135.

The spelling of 1143889985 in words is "one billion, one hundred forty-three million, eight hundred eighty-nine thousand, nine hundred eighty-five".