123405205134 has 8 divisors (see below), whose sum is σ = 246810410280. Its totient is φ = 41135068376.

The previous prime is 123405205069. The next prime is 123405205207. The reversal of 123405205134 is 431502504321.

It is a sphenic number, since it is the product of 3 distinct primes.

123405205134 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10283767089 + ... + 10283767100.

It is an arithmetic number, because the mean of its divisors is an integer number (30851301285).

Almost surely, 2^123405205134 is an apocalyptic number.

123405205134 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

123405205134 is a wasteful number, since it uses less digits than its factorization.

123405205134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20567534194.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 123405205134 its reverse (431502504321), we get a palindrome (554907709455).

The spelling of 123405205134 in words is "one hundred twenty-three billion, four hundred five million, two hundred five thousand, one hundred thirty-four".