205950138 has 16 divisors (see below), whose sum is σ = 436129920. Its totient is φ = 64611776.

The previous prime is 205950133. The next prime is 205950163. The reversal of 205950138 is 831059502.

It is a junction number, because it is equal to n+sod(n) for n = 205950099 and 205950108.

It is not an unprimeable number, because it can be changed into a prime (205950133) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1009458 + ... + 1009661.

It is an arithmetic number, because the mean of its divisors is an integer number (27258120).

Almost surely, 2^205950138 is an apocalyptic number.

205950138 is an abundant number, since it is smaller than the sum of its proper divisors (230179782).

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

205950138 is a wasteful number, since it uses less digits than its factorization.

205950138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019141.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 205950138 is about 14350.9629642056. The cubic root of 205950138 is about 590.5464037067.

The spelling of 205950138 in words is "two hundred five million, nine hundred fifty thousand, one hundred thirty-eight".