204012405 has 32 divisors (see below), whose sum is σ = 381782400. Its totient is φ = 103078656.

The previous prime is 204012397. The next prime is 204012407. The reversal of 204012405 is 504210402.

204012405 is a `hidden beast` number, since 20 + 401 + 240 + 5 = 666.

It is not a de Polignac number, because 204012405 - 2³ = 204012397 is a prime.

It is a super-2 number, since 2×204012405² = 83242122787768050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204012407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37204 + ... + 42333.

It is an arithmetic number, because the mean of its divisors is an integer number (11930700).

Almost surely, 2^204012405 is an apocalyptic number.

It is an amenable number.

204012405 is a deficient number, since it is larger than the sum of its proper divisors (177769995).

204012405 is a wasteful number, since it uses less digits than its factorization.

204012405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79570 (or 79564 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 204012405 is about 14283.2911123452. The cubic root of 204012405 is about 588.6884636889.

Adding to 204012405 its reverse (504210402), we get a palindrome (708222807).

The spelling of 204012405 in words is "two hundred four million, twelve thousand, four hundred five".