205400430 has 48 divisors (see below), whose sum is σ = 540062640. Its totient is φ = 54155904.

The previous prime is 205400423. The next prime is 205400471. The reversal of 205400430 is 34004502.

It is a happy number.

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 23 ways as a sum of consecutive naturals, for example, 4812 + ... + 20831.

It is an arithmetic number, because the mean of its divisors is an integer number (11251305).

Almost surely, 2^205400430 is an apocalyptic number.

205400430 is an abundant number, since it is smaller than the sum of its proper divisors (334662210).

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

205400430 is a wasteful number, since it uses less digits than its factorization.

205400430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25745 (or 25742 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 205400430 is about 14331.7978634922. The cubic root of 205400430 is about 590.0205202094.

Adding to 205400430 its reverse (34004502), we get a palindrome (239404932).

The spelling of 205400430 in words is "two hundred five million, four hundred thousand, four hundred thirty".