204400540 has 24 divisors (see below), whose sum is σ = 447904800. Its totient is φ = 78205248.

The previous prime is 204400529. The next prime is 204400541. The reversal of 204400540 is 45004402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204400541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221715 + ... + 222634.

It is an arithmetic number, because the mean of its divisors is an integer number (18662700).

Almost surely, 2^204400540 is an apocalyptic number.

204400540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204400540 is an abundant number, since it is smaller than the sum of its proper divisors (243504260).

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

204400540 is a wasteful number, since it uses less digits than its factorization.

204400540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444381 (or 444379 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 204400540 is about 14296.8716857920. The cubic root of 204400540 is about 589.0615551327.

Adding to 204400540 its reverse (45004402), we get a palindrome (249404942).

The spelling of 204400540 in words is "two hundred four million, four hundred thousand, five hundred forty".