205388942 has 32 divisors (see below), whose sum is σ = 355705344. Its totient is φ = 88026400.

The previous prime is 205388929. The next prime is 205388947. The reversal of 205388942 is 249883502.

It is a self number, because there is not a number n which added to its sum of digits gives 205388942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205388947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33068 + ... + 38784.

It is an arithmetic number, because the mean of its divisors is an integer number (11115792).

Almost surely, 2^205388942 is an apocalyptic number.

205388942 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

205388942 is a deficient number, since it is larger than the sum of its proper divisors (150316402).

205388942 is a wasteful number, since it uses less digits than its factorization.

205388942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5824.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 205388942 is about 14331.3970707674. The cubic root of 205388942 is about 590.0095200992.

The spelling of 205388942 in words is "two hundred five million, three hundred eighty-eight thousand, nine hundred forty-two".