204040406 has 8 divisors (see below), whose sum is σ = 319367664. Its totient is φ = 97584520.

The previous prime is 204040399. The next prime is 204040423. The reversal of 204040406 is 604040402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 2217785 + ... + 2217876.

It is an arithmetic number, because the mean of its divisors is an integer number (39920958).

Almost surely, 2^204040406 is an apocalyptic number.

204040406 is a deficient number, since it is larger than the sum of its proper divisors (115327258).

204040406 is a wasteful number, since it uses less digits than its factorization.

204040406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4435686.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 204040406 is about 14284.2712799778. The cubic root of 204040406 is about 588.7153952401.

Adding to 204040406 its reverse (604040402), we get a palindrome (808080808).

The spelling of 204040406 in words is "two hundred four million, forty thousand, four hundred six".