205272172 has 18 divisors (see below), whose sum is σ = 417875892. Its totient is φ = 87973704.

The previous prime is 205272163. The next prime is 205272187. The reversal of 205272172 is 271272502.

205272172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 205272172.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 523458 + ... + 523849.

Almost surely, 2^205272172 is an apocalyptic number.

It is an amenable number.

205272172 is an abundant number, since it is smaller than the sum of its proper divisors (212603720).

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

205272172 is a wasteful number, since it uses less digits than its factorization.

205272172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047325 (or 1047316 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 205272172 is about 14327.3225691334. The cubic root of 205272172 is about 589.8976859834.

The spelling of 205272172 in words is "two hundred five million, two hundred seventy-two thousand, one hundred seventy-two".