18729341842 has 4 divisors (see below), whose sum is σ = 28094012766. Its totient is φ = 9364670920.

The previous prime is 18729341791. The next prime is 18729341893. The reversal of 18729341842 is 24814392781.

18729341842 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24814392781 = 337 ⋅73633213.

It is an interprime number because it is at equal distance from previous prime (18729341791) and next prime (18729341893).

It can be written as a sum of positive squares in only one way, i.e., 17505671481 + 1223670361 = 132309^2 + 34981^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4682335459 + ... + 4682335462.

Almost surely, 2^18729341842 is an apocalyptic number.

18729341842 is a deficient number, since it is larger than the sum of its proper divisors (9364670924).

18729341842 is an equidigital number, since it uses as much as digits as its factorization.

18729341842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9364670923.

The product of its digits is 774144, while the sum is 49.

The spelling of 18729341842 in words is "eighteen billion, seven hundred twenty-nine million, three hundred forty-one thousand, eight hundred forty-two".