205243442 has 16 divisors (see below), whose sum is σ = 312956952. Its totient is φ = 100932480.

The previous prime is 205243393. The next prime is 205243481. The reversal of 205243442 is 244342502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 185804161 + 19439281 = 13631^2 + 4409^2 .

It is an unprimeable number.

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, 56192 + ... + 59732.

Almost surely, 2^205243442 is an apocalyptic number.

205243442 is a deficient number, since it is larger than the sum of its proper divisors (107713510).

205243442 is a wasteful number, since it uses less digits than its factorization.

205243442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013.

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 205243442 is about 14326.3199042881. The cubic root of 205243442 is about 589.8701639036.

Adding to 205243442 its reverse (244342502), we get a palindrome (449585944).

The spelling of 205243442 in words is "two hundred five million, two hundred forty-three thousand, four hundred forty-two".