18723457434 has 32 divisors (see below), whose sum is σ = 40860449280. Its totient is φ = 5672487600.

The previous prime is 18723457429. The next prime is 18723457447. The reversal of 18723457434 is 43475432781.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284289 + ... + 343899.

It is an arithmetic number, because the mean of its divisors is an integer number (1276889040).

Almost surely, 2^18723457434 is an apocalyptic number.

18723457434 is an abundant number, since it is smaller than the sum of its proper divisors (22136991846).

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

18723457434 is a wasteful number, since it uses less digits than its factorization.

18723457434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64386.

The product of its digits is 2257920, while the sum is 48.

The spelling of 18723457434 in words is "eighteen billion, seven hundred twenty-three million, four hundred fifty-seven thousand, four hundred thirty-four".