205142443 has 4 divisors (see below), whose sum is σ = 223791768. Its totient is φ = 186493120.

The previous prime is 205142423. The next prime is 205142447. The reversal of 205142443 is 344241502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 205142443 - 2⁹ = 205141931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205142447) 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, 9324646 + ... + 9324667.

It is an arithmetic number, because the mean of its divisors is an integer number (55947942).

Almost surely, 2^205142443 is an apocalyptic number.

205142443 is a deficient number, since it is larger than the sum of its proper divisors (18649325).

205142443 is a wasteful number, since it uses less digits than its factorization.

205142443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18649324.

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

The square root of 205142443 is about 14322.7945248125. The cubic root of 205142443 is about 589.7733909022.

Adding to 205142443 its reverse (344241502), we get a palindrome (549383945).

The spelling of 205142443 in words is "two hundred five million, one hundred forty-two thousand, four hundred forty-three".