204124405 has 4 divisors (see below), whose sum is σ = 244949292. Its totient is φ = 163299520.

The previous prime is 204124399. The next prime is 204124421. The reversal of 204124405 is 504421402.

It is a happy number.

204124405 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, and also an emirpimes, since its reverse is a distinct semiprime: 504421402 = 2 ⋅252210701.

It can be written as a sum of positive squares in 2 ways, for example, as 116683204 + 87441201 = 10802^2 + 9351^2 .

It is not a de Polignac number, because 204124405 - 2⁵ = 204124373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20412436 + ... + 20412445.

It is an arithmetic number, because the mean of its divisors is an integer number (61237323).

Almost surely, 2^204124405 is an apocalyptic number.

It is an amenable number.

204124405 is a deficient number, since it is larger than the sum of its proper divisors (40824887).

204124405 is an equidigital number, since it uses as much as digits as its factorization.

204124405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40824886.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 204124405 is about 14287.2112394267. The cubic root of 204124405 is about 588.7961712671.

Adding to 204124405 its reverse (504421402), we get a palindrome (708545807).

It can be divided in two parts, 204 and 124405, that added together give a square (124609 = 353²).

The spelling of 204124405 in words is "two hundred four million, one hundred twenty-four thousand, four hundred five".