205439172 has 48 divisors (see below), whose sum is σ = 508347840. Its totient is φ = 64392192.

The previous prime is 205439149. The next prime is 205439177. The reversal of 205439172 is 271934502.

205439172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (205439177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27948 + ... + 34524.

It is an arithmetic number, because the mean of its divisors is an integer number (10590580).

Almost surely, 2^205439172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205439172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254173920).

205439172 is an abundant number, since it is smaller than the sum of its proper divisors (302908668).

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

205439172 is a wasteful number, since it uses less digits than its factorization.

205439172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6740 (or 6738 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 205439172 is about 14333.1494096727. The cubic root of 205439172 is about 590.0576138318.

The spelling of 205439172 in words is "two hundred five million, four hundred thirty-nine thousand, one hundred seventy-two".