18389975029 has 4 divisors (see below), whose sum is σ = 19471738284. Its totient is φ = 17308211776.

The previous prime is 18389974957. The next prime is 18389975069. The reversal of 18389975029 is 92057998381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7546918129 + 10843056900 = 86873^2 + 104130^2 .

It is a cyclic number.

It is not a de Polignac number, because 18389975029 - 2²⁵ = 18356420597 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 (18389975069) 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, 540881602 + ... + 540881635.

It is an arithmetic number, because the mean of its divisors is an integer number (4867934571).

Almost surely, 2^18389975029 is an apocalyptic number.

It is an amenable number.

18389975029 is a deficient number, since it is larger than the sum of its proper divisors (1081763255).

18389975029 is a wasteful number, since it uses less digits than its factorization.

18389975029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081763254.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 18389975029 in words is "eighteen billion, three hundred eighty-nine million, nine hundred seventy-five thousand, twenty-nine".