168538 has 8 divisors (see below), whose sum is σ = 267732. Its totient is φ = 79296.

The previous prime is 168533. The next prime is 168541. The reversal of 168538 is 835861.

It can be written as a sum of positive squares in 2 ways, for example, as 149769 + 18769 = 387^2 + 137^2 .

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

It is not an unprimeable number, because it can be changed into a prime (168533) 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, 2445 + ... + 2512.

2¹⁶⁸⁵³⁸ is an apocalyptic number.

168538 is a deficient number, since it is larger than the sum of its proper divisors (99194).

168538 is a wasteful number, since it uses less digits than its factorization.

168538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4976.

The product of its digits is 5760, while the sum is 31.

The square root of 168538 is about 410.5337988522. The cubic root of 168538 is about 55.2373216065.

It can be divided in two parts, 16853 and 8, that added together give a palindrome (16861).

The spelling of 168538 in words is "one hundred sixty-eight thousand, five hundred thirty-eight".