18423126405 has 48 divisors (see below), whose sum is σ = 33133149504. Its totient is φ = 9820621440.

The previous prime is 18423126401. The next prime is 18423126413. The reversal of 18423126405 is 50462132481.

It is a happy number.

18423126405 is a `hidden beast` number, since 1 + 8 + 4 + 2 + 3 + 1 + 2 + 640 + 5 = 666.

It is not a de Polignac number, because 18423126405 - 2² = 18423126401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18423126405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18423126401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4713462 + ... + 4717368.

It is an arithmetic number, because the mean of its divisors is an integer number (690273948).

Almost surely, 2^18423126405 is an apocalyptic number.

18423126405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18423126405 is a deficient number, since it is larger than the sum of its proper divisors (14710023099).

18423126405 is an equidigital number, since it uses as much as digits as its factorization.

18423126405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7808 (or 7796 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 18423126405 its reverse (50462132481), we get a palindrome (68885258886).

The spelling of 18423126405 in words is "eighteen billion, four hundred twenty-three million, one hundred twenty-six thousand, four hundred five".