168390 has 24 divisors (see below), whose sum is σ = 438048. Its totient is φ = 44880.

The previous prime is 168353. The next prime is 168391. The reversal of 168390 is 93861.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 846 + ... + 1025.

It is an arithmetic number, because the mean of its divisors is an integer number (18252).

2¹⁶⁸³⁹⁰ is an apocalyptic number.

168390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168390 is an abundant number, since it is smaller than the sum of its proper divisors (269658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168390 is a wasteful number, since it uses less digits than its factorization.

168390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884 (or 1881 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 168390 is about 410.3535061383. The cubic root of 168390 is about 55.2211481664.

Subtracting from 168390 its reverse (93861), we obtain a square (74529 = 273²).

The spelling of 168390 in words is "one hundred sixty-eight thousand, three hundred ninety".