205434142 has 4 divisors (see below), whose sum is σ = 308151216. Its totient is φ = 102717070.

The previous prime is 205434109. The next prime is 205434143. The reversal of 205434142 is 241434502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 241434502 = 2 ⋅120717251.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205434143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51358534 + ... + 51358537.

It is an arithmetic number, because the mean of its divisors is an integer number (77037804).

Almost surely, 2^205434142 is an apocalyptic number.

205434142 is a deficient number, since it is larger than the sum of its proper divisors (102717074).

205434142 is a wasteful number, since it uses less digits than its factorization.

205434142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102717073.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 205434142 is about 14332.9739412308. The cubic root of 205434142 is about 590.0527981095.

Adding to 205434142 its reverse (241434502), we get a palindrome (446868644).

The spelling of 205434142 in words is "two hundred five million, four hundred thirty-four thousand, one hundred forty-two".