205142923 has 4 divisors (see below), whose sum is σ = 205428960. Its totient is φ = 204856888.

The previous prime is 205142909. The next prime is 205142933. The reversal of 205142923 is 329241502.

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 205142923 - 2⁵ = 205142891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205142891 and 205142900.

It is not an unprimeable number, because it can be changed into a prime (205142933) 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, 141940 + ... + 143377.

It is an arithmetic number, because the mean of its divisors is an integer number (51357240).

Almost surely, 2^205142923 is an apocalyptic number.

205142923 is a deficient number, since it is larger than the sum of its proper divisors (286037).

205142923 is an equidigital number, since it uses as much as digits as its factorization.

205142923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286036.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 205142923 is about 14322.8112813093. The cubic root of 205142923 is about 589.7738508931.

The spelling of 205142923 in words is "two hundred five million, one hundred forty-two thousand, nine hundred twenty-three".