172998 has 24 divisors (see below), whose sum is σ = 428688. Its totient is φ = 49392.

The previous prime is 172993. The next prime is 172999. The reversal of 172998 is 899271.

It is a happy number.

172998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172993) by changing a digit.

172998 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 11 ways as a sum of consecutive naturals, for example, 561 + ... + 812.

It is an arithmetic number, because the mean of its divisors is an integer number (17862).

2¹⁷²⁹⁹⁸ is an apocalyptic number.

172998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172998 is an abundant number, since it is smaller than the sum of its proper divisors (255690).

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

172998 is a wasteful number, since it uses less digits than its factorization.

172998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388 (or 1385 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 172998 is about 415.9302826196. The cubic root of 172998 is about 55.7203318319.

The spelling of 172998 in words is "one hundred seventy-two thousand, nine hundred ninety-eight".