18024720439 has 4 divisors (see below), whose sum is σ = 19663331400. Its totient is φ = 16386109480.

The previous prime is 18024720421. The next prime is 18024720449. The reversal of 18024720439 is 93402742081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93402742081 = 11 ⋅8491158371.

It is a cyclic number.

It is not a de Polignac number, because 18024720439 - 2²⁷ = 17890502711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18024720419) 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, 819305464 + ... + 819305485.

It is an arithmetic number, because the mean of its divisors is an integer number (4915832850).

Almost surely, 2^18024720439 is an apocalyptic number.

18024720439 is a deficient number, since it is larger than the sum of its proper divisors (1638610961).

18024720439 is a wasteful number, since it uses less digits than its factorization.

18024720439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638610960.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 18024720439 in words is "eighteen billion, twenty-four million, seven hundred twenty thousand, four hundred thirty-nine".