205042403 has 4 divisors (see below), whose sum is σ = 205417800. Its totient is φ = 204667008.

The previous prime is 205042399. The next prime is 205042429. The reversal of 205042403 is 304240502.

205042403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205042403 - 2² = 205042399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205042483) 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, 186878 + ... + 187971.

It is an arithmetic number, because the mean of its divisors is an integer number (51354450).

Almost surely, 2^205042403 is an apocalyptic number.

205042403 is a deficient number, since it is larger than the sum of its proper divisors (375397).

205042403 is an equidigital number, since it uses as much as digits as its factorization.

205042403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375396.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 205042403 is about 14319.3017637034. The cubic root of 205042403 is about 589.6775054570.

Adding to 205042403 its reverse (304240502), we get a palindrome (509282905).

The spelling of 205042403 in words is "two hundred five million, forty-two thousand, four hundred three".