172130500 has 48 divisors (see below), whose sum is σ = 395740800. Its totient is φ = 65224800.

The previous prime is 172130489. The next prime is 172130503. The reversal of 172130500 is 5031271.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (172130503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441 + ... + 18559.

It is an arithmetic number, because the mean of its divisors is an integer number (8244600).

Almost surely, 2^172130500 is an apocalyptic number.

172130500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172130500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197870400).

172130500 is an abundant number, since it is smaller than the sum of its proper divisors (223610300).

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

172130500 is a wasteful number, since it uses less digits than its factorization.

172130500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18157 (or 18145 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 172130500 is about 13119.8513711094. The cubic root of 172130500 is about 556.2703901965.

Adding to 172130500 its reverse (5031271), we get a palindrome (177161771).

The spelling of 172130500 in words is "one hundred seventy-two million, one hundred thirty thousand, five hundred".