1143839891 has 8 divisors (see below), whose sum is σ = 1197370368. Its totient is φ = 1091349000.

The previous prime is 1143839833. The next prime is 1143839911. The reversal of 1143839891 is 1989383411.

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

It is a cyclic number.

It is not a de Polignac number, because 1143839891 - 2¹⁴ = 1143823507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143839821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257645 + ... + 262046.

It is an arithmetic number, because the mean of its divisors is an integer number (149671296).

Almost surely, 2^1143839891 is an apocalyptic number.

1143839891 is a deficient number, since it is larger than the sum of its proper divisors (53530477).

1143839891 is an equidigital number, since it uses as much as digits as its factorization.

1143839891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519793.

The product of its digits is 186624, while the sum is 47.

The square root of 1143839891 is about 33820.7021068457. The cubic root of 1143839891 is about 1045.8155126155.

The spelling of 1143839891 in words is "one billion, one hundred forty-three million, eight hundred thirty-nine thousand, eight hundred ninety-one".