18723457436 has 12 divisors (see below), whose sum is σ = 33016173960. Its totient is φ = 9290264880.

The previous prime is 18723457429. The next prime is 18723457447. The reversal of 18723457436 is 63475432781.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 17865371 + ... + 17866418.

It is an arithmetic number, because the mean of its divisors is an integer number (2751347830).

Almost surely, 2^18723457436 is an apocalyptic number.

It is an amenable number.

18723457436 is a deficient number, since it is larger than the sum of its proper divisors (14292716524).

18723457436 is a wasteful number, since it uses less digits than its factorization.

18723457436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35731924 (or 35731922 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 50.

It can be divided in two parts, 1872345 and 7436, that added together give a palindrome (1879781).

The spelling of 18723457436 in words is "eighteen billion, seven hundred twenty-three million, four hundred fifty-seven thousand, four hundred thirty-six".