204434340138 has 48 divisors (see below), whose sum is σ = 518565168576. Its totient is φ = 56985180480.

The previous prime is 204434340101. The next prime is 204434340139. The reversal of 204434340138 is 831043434402.

204434340138 is a `hidden beast` number, since 2 + 0 + 443 + 43 + 40 + 138 = 666.

It is not an unprimeable number, because it can be changed into a prime (204434340139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19781356 + ... + 19791687.

It is an arithmetic number, because the mean of its divisors is an integer number (10803441012).

Almost surely, 2^204434340138 is an apocalyptic number.

204434340138 is an abundant number, since it is smaller than the sum of its proper divisors (314130828438).

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

204434340138 is a wasteful number, since it uses less digits than its factorization.

204434340138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39573099 (or 39573096 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The spelling of 204434340138 in words is "two hundred four billion, four hundred thirty-four million, three hundred forty thousand, one hundred thirty-eight".