989645 has 8 divisors (see below), whose sum is σ = 1215456. Its totient is φ = 773136.

The previous prime is 989641. The next prime is 989647. The reversal of 989645 is 546989.

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 989645 - 2² = 989641 is a prime.

It is a super-3 number, since 3×989645³ = 2907766703248533375, which contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 2087 + ... + 2516.

It is an arithmetic number, because the mean of its divisors is an integer number (151932).

2⁹⁸⁹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

989645 is a deficient number, since it is larger than the sum of its proper divisors (225811).

989645 is a wasteful number, since it uses less digits than its factorization.

989645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4651.

The product of its digits is 77760, while the sum is 41.

The square root of 989645 is about 994.8090268991. The cubic root of 989645 is about 99.6536350315.

The spelling of 989645 in words is "nine hundred eighty-nine thousand, six hundred forty-five".