204290123 has 4 divisors (see below), whose sum is σ = 211334640. Its totient is φ = 197245608.

The previous prime is 204290113. The next prime is 204290137. The reversal of 204290123 is 321092402.

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 204290123 - 2²⁶ = 137181259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204290113) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3522215 + ... + 3522272.

It is an arithmetic number, because the mean of its divisors is an integer number (52833660).

Almost surely, 2^204290123 is an apocalyptic number.

204290123 is a deficient number, since it is larger than the sum of its proper divisors (7044517).

204290123 is an equidigital number, since it uses as much as digits as its factorization.

204290123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044516.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 204290123 is about 14293.0095851084. The cubic root of 204290123 is about 588.9554658415.

The spelling of 204290123 in words is "two hundred four million, two hundred ninety thousand, one hundred twenty-three".