172530 has 48 divisors (see below), whose sum is σ = 471744. Its totient is φ = 45360.

The previous prime is 172519. The next prime is 172541. The reversal of 172530 is 35271.

172530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (172519) and next prime (172541).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2395 + ... + 2465.

It is an arithmetic number, because the mean of its divisors is an integer number (9828).

2¹⁷²⁵³⁰ is an apocalyptic number.

172530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 172530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235872).

172530 is an abundant number, since it is smaller than the sum of its proper divisors (299214).

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

172530 is an equidigital number, since it uses as much as digits as its factorization.

172530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 172530 is about 415.3673073317. The cubic root of 172530 is about 55.6700409507.

The spelling of 172530 in words is "one hundred seventy-two thousand, five hundred thirty".