168401 has 4 divisors (see below), whose sum is σ = 172032. Its totient is φ = 164772.

The previous prime is 168391. The next prime is 168409. The reversal of 168401 is 104861.

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 an emirpimes, since its reverse is a distinct semiprime: 104861 = 19 ⋅5519.

It is a cyclic number.

It is not a de Polignac number, because 168401 - 2¹⁴ = 152017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168409) 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, 1745 + ... + 1838.

It is an arithmetic number, because the mean of its divisors is an integer number (43008).

2¹⁶⁸⁴⁰¹ is an apocalyptic number.

It is an amenable number.

168401 is a deficient number, since it is larger than the sum of its proper divisors (3631).

168401 is an equidigital number, since it uses as much as digits as its factorization.

168401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 168401 is about 410.3669089973. The cubic root of 168401 is about 55.2223505723. Note that the first 3 decimals are identical.

The spelling of 168401 in words is "one hundred sixty-eight thousand, four hundred one".