205297172 has 12 divisors (see below), whose sum is σ = 374890656. Its totient is φ = 98185560.

The previous prime is 205297171. The next prime is 205297199. The reversal of 205297172 is 271792502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205297171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115654 + ... + 1115837.

It is an arithmetic number, because the mean of its divisors is an integer number (31240888).

Almost surely, 2^205297172 is an apocalyptic number.

It is an amenable number.

205297172 is a deficient number, since it is larger than the sum of its proper divisors (169593484).

205297172 is a wasteful number, since it uses less digits than its factorization.

205297172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231518 (or 2231516 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 205297172 is about 14328.1950014648. The cubic root of 205297172 is about 589.9216327973.

The spelling of 205297172 in words is "two hundred five million, two hundred ninety-seven thousand, one hundred seventy-two".