1000543989 has 4 divisors (see below), whose sum is σ = 1334058656. Its totient is φ = 667029324.

The previous prime is 1000543979. The next prime is 1000543991. The reversal of 1000543989 is 9893450001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-1000543989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000543979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166757329 + ... + 166757334.

It is an arithmetic number, because the mean of its divisors is an integer number (333514664).

Almost surely, 2^1000543989 is an apocalyptic number.

It is an amenable number.

1000543989 is a deficient number, since it is larger than the sum of its proper divisors (333514667).

1000543989 is an equidigital number, since it uses as much as digits as its factorization.

1000543989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333514666.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 1000543989 is about 31631.3766535698. The cubic root of 1000543989 is about 1000.1812967962.

The spelling of 1000543989 in words is "one billion, five hundred forty-three thousand, nine hundred eighty-nine".