204873391 has 4 divisors (see below), whose sum is σ = 204924712. Its totient is φ = 204822072.

The previous prime is 204873379. The next prime is 204873401. The reversal of 204873391 is 193378402.

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 204873391 - 2⁹ = 204872879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204873391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204873301) 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, 19116 + ... + 27841.

It is an arithmetic number, because the mean of its divisors is an integer number (51231178).

Almost surely, 2^204873391 is an apocalyptic number.

204873391 is a deficient number, since it is larger than the sum of its proper divisors (51321).

204873391 is an equidigital number, since it uses as much as digits as its factorization.

204873391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51320.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 204873391 is about 14313.3990023334. The cubic root of 204873391 is about 589.5154414662.

The spelling of 204873391 in words is "two hundred four million, eight hundred seventy-three thousand, three hundred ninety-one".