168139 has 4 divisors (see below), whose sum is σ = 169024. Its totient is φ = 167256.

The previous prime is 168127. The next prime is 168143. The reversal of 168139 is 931861.

It is a happy number.

It is a semiprime because it is the product of two primes, 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 168139 - 2⁹ = 167627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168109) 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, 27 + ... + 580.

It is an arithmetic number, because the mean of its divisors is an integer number (42256).

2¹⁶⁸¹³⁹ is an apocalyptic number.

168139 is a deficient number, since it is larger than the sum of its proper divisors (885).

168139 is an equidigital number, since it uses as much as digits as its factorization.

168139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884.

The product of its digits is 1296, while the sum is 28.

The square root of 168139 is about 410.0475582173. The cubic root of 168139 is about 55.1936972080.

The spelling of 168139 in words is "one hundred sixty-eight thousand, one hundred thirty-nine".