205129812 has 12 divisors (see below), whose sum is σ = 478636256. Its totient is φ = 68376600.

The previous prime is 205129811. The next prime is 205129817. The reversal of 205129812 is 218921502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 205129812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205129811) 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, 8547064 + ... + 8547087.

Almost surely, 2^205129812 is an apocalyptic number.

It is an amenable number.

205129812 is an abundant number, since it is smaller than the sum of its proper divisors (273506444).

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

205129812 is a wasteful number, since it uses less digits than its factorization.

205129812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17094158 (or 17094156 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 205129812 is about 14322.3535775375. The cubic root of 205129812 is about 589.7612861739.

The spelling of 205129812 in words is "two hundred five million, one hundred twenty-nine thousand, eight hundred twelve".