172642205 has 8 divisors (see below), whose sum is σ = 211988832. Its totient is φ = 134901648.

The previous prime is 172642181. The next prime is 172642219. The reversal of 172642205 is 502246271.

It is a happy number.

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 172642205 - 2⁸ = 172641949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401279 + ... + 401708.

It is an arithmetic number, because the mean of its divisors is an integer number (26498604).

Almost surely, 2^172642205 is an apocalyptic number.

It is an amenable number.

172642205 is a deficient number, since it is larger than the sum of its proper divisors (39346627).

172642205 is an equidigital number, since it uses as much as digits as its factorization.

172642205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803035.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 172642205 is about 13139.3380731299. The cubic root of 172642205 is about 556.8210668476.

Adding to 172642205 its reverse (502246271), we get a palindrome (674888476).

The spelling of 172642205 in words is "one hundred seventy-two million, six hundred forty-two thousand, two hundred five".