18344090038 has 4 divisors (see below), whose sum is σ = 27516135060. Its totient is φ = 9172045018.

The previous prime is 18344090033. The next prime is 18344090123. The reversal of 18344090038 is 83009044381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83009044381 = 73 ⋅1137110197.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18344090033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4586022508 + ... + 4586022511.

It is an arithmetic number, because the mean of its divisors is an integer number (6879033765).

Almost surely, 2^18344090038 is an apocalyptic number.

18344090038 is a deficient number, since it is larger than the sum of its proper divisors (9172045022).

18344090038 is an equidigital number, since it uses as much as digits as its factorization.

18344090038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9172045021.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 18344090038 in words is "eighteen billion, three hundred forty-four million, ninety thousand, thirty-eight".