18243314438 has 4 divisors (see below), whose sum is σ = 27364971660. Its totient is φ = 9121657218.

The previous prime is 18243314437. The next prime is 18243314443. The reversal of 18243314438 is 83441334281.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 18243314395 and 18243314404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243314437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4560828608 + ... + 4560828611.

It is an arithmetic number, because the mean of its divisors is an integer number (6841242915).

Almost surely, 2^18243314438 is an apocalyptic number.

18243314438 is a deficient number, since it is larger than the sum of its proper divisors (9121657222).

18243314438 is an equidigital number, since it uses as much as digits as its factorization.

18243314438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9121657221.

The product of its digits is 221184, while the sum is 41.

The spelling of 18243314438 in words is "eighteen billion, two hundred forty-three million, three hundred fourteen thousand, four hundred thirty-eight".