172128203 has 8 divisors (see below), whose sum is σ = 185685696. Its totient is φ = 158616000.

The previous prime is 172128169. The next prime is 172128223. The reversal of 172128203 is 302821271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172128203 - 2¹² = 172124107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172128223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3203 + ... + 18828.

It is an arithmetic number, because the mean of its divisors is an integer number (23210712).

Almost surely, 2^172128203 is an apocalyptic number.

172128203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

172128203 is a deficient number, since it is larger than the sum of its proper divisors (13557493).

172128203 is a wasteful number, since it uses less digits than its factorization.

172128203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22645.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 172128203 is about 13119.7638317159. The cubic root of 172128203 is about 556.2679157972.

Adding to 172128203 its reverse (302821271), we get a palindrome (474949474).

The spelling of 172128203 in words is "one hundred seventy-two million, one hundred twenty-eight thousand, two hundred three".