1000143 has 6 divisors (see below), whose sum is σ = 1444664. Its totient is φ = 666756.

The previous prime is 1000133. The next prime is 1000151. The reversal of 1000143 is 3410001.

It is not a de Polignac number, because 1000143 - 2⁹ = 999631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 111127 = 1000143 / (1 + 0 + 0 + 0 + 1 + 4 + 3).

It is a Duffinian number.

1000143 is a modest number, since divided by 143 gives 1 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55555 + ... + 55572.

2^1000143 is an apocalyptic number.

1000143 is a deficient number, since it is larger than the sum of its proper divisors (444521).

1000143 is a wasteful number, since it uses less digits than its factorization.

1000143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111133 (or 111130 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1000143 is about 1000.0714974441. The cubic root of 1000143 is about 100.0047664395.

Adding to 1000143 its reverse (3410001), we get a palindrome (4410144).

The spelling of 1000143 in words is "one million, one hundred forty-three", and thus it is an aban number.