18039343847 has 4 divisors (see below), whose sum is σ = 20616392976. Its totient is φ = 15462294720.

The previous prime is 18039343837. The next prime is 18039343853. The reversal of 18039343847 is 74834393081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74834393081 = 7 ⋅10690627583.

It is a cyclic number.

It is not a de Polignac number, because 18039343847 - 2⁸ = 18039343591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18039343795 and 18039343804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039343837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288524554 + ... + 1288524567.

It is an arithmetic number, because the mean of its divisors is an integer number (5154098244).

Almost surely, 2^18039343847 is an apocalyptic number.

18039343847 is a deficient number, since it is larger than the sum of its proper divisors (2577049129).

18039343847 is an equidigital number, since it uses as much as digits as its factorization.

18039343847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577049128.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 18039343847 in words is "eighteen billion, thirty-nine million, three hundred forty-three thousand, eight hundred forty-seven".