204040040 has 32 divisors (see below), whose sum is σ = 459504360. Its totient is φ = 81542400.

The previous prime is 204040021. The next prime is 204040051. The reversal of 204040040 is 40040402.

It can be written as a sum of positive squares in 4 ways, for example, as 69989956 + 134050084 = 8366^2 + 11578^2 .

It is a junction number, because it is equal to n+sod(n) for n = 204039997 and 204040024.

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 7 ways as a sum of consecutive naturals, for example, 73070 + ... + 75810.

Almost surely, 2^204040040 is an apocalyptic number.

204040040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204040040 is an abundant number, since it is smaller than the sum of its proper divisors (255464320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204040040 is a wasteful number, since it uses less digits than its factorization.

204040040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4613 (or 4609 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 204040040 is about 14284.2584686780. The cubic root of 204040040 is about 588.7150432347.

Adding to 204040040 its reverse (40040402), we get a palindrome (244080442).

The spelling of 204040040 in words is "two hundred four million, forty thousand, forty".