172018 has 16 divisors (see below), whose sum is σ = 321984. Its totient is φ = 66960.

The previous prime is 172009. The next prime is 172021. The reversal of 172018 is 810271.

It is a junction number, because it is equal to n+sod(n) for n = 171986 and 172004.

It is an unprimeable number.

172018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405 + ... + 712.

It is an arithmetic number, because the mean of its divisors is an integer number (20124).

2¹⁷²⁰¹⁸ is an apocalyptic number.

172018 is a deficient number, since it is larger than the sum of its proper divisors (149966).

172018 is a wasteful number, since it uses less digits than its factorization.

172018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 172018 is about 414.7505274258. The cubic root of 172018 is about 55.6149175851.

Adding to 172018 its reverse (810271), we get a palindrome (982289).

The spelling of 172018 in words is "one hundred seventy-two thousand, eighteen".