18453905839 has 4 divisors (see below), whose sum is σ = 18636617880. Its totient is φ = 18271193800.

The previous prime is 18453905749. The next prime is 18453905851. The reversal of 18453905839 is 93850935481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93850935481 = 383 ⋅245041607.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18453905839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18453905839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18453905879) 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 in 3 ways as a sum of consecutive naturals, for example, 91355869 + ... + 91356070.

It is an arithmetic number, because the mean of its divisors is an integer number (4659154470).

Almost surely, 2^18453905839 is an apocalyptic number.

18453905839 is a deficient number, since it is larger than the sum of its proper divisors (182712041).

18453905839 is a wasteful number, since it uses less digits than its factorization.

18453905839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182712040.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 18453905839 in words is "eighteen billion, four hundred fifty-three million, nine hundred five thousand, eight hundred thirty-nine".