168389 has 4 divisors (see below), whose sum is σ = 181356. Its totient is φ = 155424.

The previous prime is 168353. The next prime is 168391. The reversal of 168389 is 983861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20164 + 148225 = 142^2 + 385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168389 is a prime.

It is an Ulam number.

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, 6464 + ... + 6489.

It is an arithmetic number, because the mean of its divisors is an integer number (45339).

2¹⁶⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

168389 is a deficient number, since it is larger than the sum of its proper divisors (12967).

168389 is a wasteful number, since it uses less digits than its factorization.

168389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12966.

The product of its digits is 10368, while the sum is 35.

The square root of 168389 is about 410.3522876749. The cubic root of 168389 is about 55.2210388542.

The spelling of 168389 in words is "one hundred sixty-eight thousand, three hundred eighty-nine".