989643 has 8 divisors (see below), whose sum is σ = 1332288. Its totient is φ = 653384.

The previous prime is 989641. The next prime is 989647. The reversal of 989643 is 346989.

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 989643 - 2¹ = 989641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989641) 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, 1221 + ... + 1862.

It is an arithmetic number, because the mean of its divisors is an integer number (166536).

2⁹⁸⁹⁶⁴³ is an apocalyptic number.

989643 is a deficient number, since it is larger than the sum of its proper divisors (342645).

989643 is a wasteful number, since it uses less digits than its factorization.

989643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193.

The product of its digits is 46656, while the sum is 39.

The square root of 989643 is about 994.8080216806. The cubic root of 989643 is about 99.6535679006.

The spelling of 989643 in words is "nine hundred eighty-nine thousand, six hundred forty-three".