18439824529 has 4 divisors (see below), whose sum is σ = 21074085184. Its totient is φ = 15805563876.

The previous prime is 18439824517. The next prime is 18439824587. The reversal of 18439824529 is 92542893481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92542893481 = 105509 ⋅877109.

It is a cyclic number.

It is not a de Polignac number, because 18439824529 - 2¹¹ = 18439822481 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 18439824529.

It is not an unprimeable number, because it can be changed into a prime (18439824509) 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, 1317130317 + ... + 1317130330.

It is an arithmetic number, because the mean of its divisors is an integer number (5268521296).

Almost surely, 2^18439824529 is an apocalyptic number.

It is an amenable number.

18439824529 is a deficient number, since it is larger than the sum of its proper divisors (2634260655).

18439824529 is an equidigital number, since it uses as much as digits as its factorization.

18439824529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634260654.

The product of its digits is 4976640, while the sum is 55.

The spelling of 18439824529 in words is "eighteen billion, four hundred thirty-nine million, eight hundred twenty-four thousand, five hundred twenty-nine".