1143999 has 12 divisors (see below), whose sum is σ = 1674400. Its totient is φ = 752544.

The previous prime is 1143977. The next prime is 1144001. The reversal of 1143999 is 9993411.

It is not a de Polignac number, because 1143999 - 2⁹ = 1143487 is a prime.

It is a Duffinian number.

1143999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94 + ... + 1515.

2^1143999 is an apocalyptic number.

1143999 is a deficient number, since it is larger than the sum of its proper divisors (530401).

1143999 is a wasteful number, since it uses less digits than its factorization.

1143999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694 (or 1691 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 1143999 is about 1069.5788890961. The cubic root of 1143999 is about 104.5864001612.

The spelling of 1143999 in words is "one million, one hundred forty-three thousand, nine hundred ninety-nine".