168989 has 4 divisors (see below), whose sum is σ = 169824. Its totient is φ = 168156.

The previous prime is 168977. The next prime is 168991. The reversal of 168989 is 989861.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 168989 - 2¹² = 164893 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 (168089) 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, 104 + ... + 590.

It is an arithmetic number, because the mean of its divisors is an integer number (42456).

2¹⁶⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

168989 is a deficient number, since it is larger than the sum of its proper divisors (835).

168989 is an equidigital number, since it uses as much as digits as its factorization.

168989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834.

The product of its digits is 31104, while the sum is 41.

The square root of 168989 is about 411.0827167372. The cubic root of 168989 is about 55.2865485738.

The spelling of 168989 in words is "one hundred sixty-eight thousand, nine hundred eighty-nine".