204121540 has 24 divisors (see below), whose sum is σ = 489892032. Its totient is φ = 69984480.

The previous prime is 204121529. The next prime is 204121549. The reversal of 204121540 is 45121402.

It is not an unprimeable number, because it can be changed into a prime (204121549) 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, 728866 + ... + 729145.

It is an arithmetic number, because the mean of its divisors is an integer number (20412168).

Almost surely, 2^204121540 is an apocalyptic number.

204121540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204121540 is an abundant number, since it is smaller than the sum of its proper divisors (285770492).

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

204121540 is a wasteful number, since it uses less digits than its factorization.

204121540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458027 (or 1458025 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 204121540 is about 14287.1109745813. The cubic root of 204121540 is about 588.7934165598.

Adding to 204121540 its reverse (45121402), we get a palindrome (249242942).

It can be divided in two parts, 20412 and 1540, that added together give a cube (21952 = 28³).

The spelling of 204121540 in words is "two hundred four million, one hundred twenty-one thousand, five hundred forty".