989621 has 8 divisors (see below), whose sum is σ = 1093824. Its totient is φ = 890560.

The previous prime is 989581. The next prime is 989623. The reversal of 989621 is 126989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 989621 - 2⁶ = 989557 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 (989623) 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, 875 + ... + 1656.

It is an arithmetic number, because the mean of its divisors is an integer number (136728).

2⁹⁸⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

989621 is a deficient number, since it is larger than the sum of its proper divisors (104203).

989621 is a wasteful number, since it uses less digits than its factorization.

989621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571.

The product of its digits is 7776, while the sum is 35.

The square root of 989621 is about 994.7969642093. The cubic root of 989621 is about 99.6528294542.

The spelling of 989621 in words is "nine hundred eighty-nine thousand, six hundred twenty-one".