205240172 has 12 divisors (see below), whose sum is σ = 361755240. Its totient is φ = 101881536.

The previous prime is 205240151. The next prime is 205240177. The reversal of 205240172 is 271042502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (205240177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184013 + ... + 185124.

It is an arithmetic number, because the mean of its divisors is an integer number (30146270).

Almost surely, 2^205240172 is an apocalyptic number.

It is an amenable number.

205240172 is a deficient number, since it is larger than the sum of its proper divisors (156515068).

205240172 is a wasteful number, since it uses less digits than its factorization.

205240172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369280 (or 369278 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 205240172 is about 14326.2057782233. The cubic root of 205240172 is about 589.8670312243.

Adding to 205240172 its reverse (271042502), we get a palindrome (476282674).

It can be divided in two parts, 2052 and 40172, that added together give a palindrome (42224).

The spelling of 205240172 in words is "two hundred five million, two hundred forty thousand, one hundred seventy-two".