989643903 has 4 divisors (see below), whose sum is σ = 1319525208. Its totient is φ = 659762600.

The previous prime is 989643871. The next prime is 989643911. The reversal of 989643903 is 309346989.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 989643903 - 2⁵ = 989643871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989643953) 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, 164940648 + ... + 164940653.

It is an arithmetic number, because the mean of its divisors is an integer number (329881302).

Almost surely, 2^989643903 is an apocalyptic number.

989643903 is a deficient number, since it is larger than the sum of its proper divisors (329881305).

989643903 is a wasteful number, since it uses less digits than its factorization.

989643903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329881304.

The product of its (nonzero) digits is 1259712, while the sum is 51.

The square root of 989643903 is about 31458.6061833642. The cubic root of 989643903 is about 996.5359821021.

The spelling of 989643903 in words is "nine hundred eighty-nine million, six hundred forty-three thousand, nine hundred three".