204440400 has 180 divisors, whose sum is σ = 717348060. Its totient is φ = 53913600.

The previous prime is 204440393. The next prime is 204440413. The reversal of 204440400 is 4044402.

It is a happy number.

204440400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 4613904 + 199826496 = 2148^2 + 14136^2 .

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 392140 + ... + 392660.

It is an arithmetic number, because the mean of its divisors is an integer number (3985267).

Almost surely, 2^204440400 is an apocalyptic number.

204440400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204440400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358674030).

204440400 is an abundant number, since it is smaller than the sum of its proper divisors (512907660).

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

204440400 is a wasteful number, since it uses less digits than its factorization.

204440400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 204440400 is about 14298.2656290894. The cubic root of 204440400 is about 589.0998434651.

Adding to 204440400 its reverse (4044402), we get a palindrome (208484802).

The spelling of 204440400 in words is "two hundred four million, four hundred forty thousand, four hundred".