18129793 has 12 divisors (see below), whose sum is σ = 20037780. Its totient is φ = 16390880.

The previous prime is 18129791. The next prime is 18129847. The reversal of 18129793 is 39792181.

It can be written as a sum of positive squares in 2 ways, for example, as 1385329 + 16744464 = 1177^2 + 4092^2 .

It is not a de Polignac number, because 18129793 - 2¹ = 18129791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18129791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32271 + ... + 32827.

It is an arithmetic number, because the mean of its divisors is an integer number (1669815).

Almost surely, 2^18129793 is an apocalyptic number.

It is an amenable number.

18129793 is a deficient number, since it is larger than the sum of its proper divisors (1907987).

18129793 is a wasteful number, since it uses less digits than its factorization.

18129793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 837 counting only the distinct ones).

The product of its digits is 27216, while the sum is 40.

The square root of 18129793 is about 4257.9094635748. The cubic root of 18129793 is about 262.7025460177.

The spelling of 18129793 in words is "eighteen million, one hundred twenty-nine thousand, seven hundred ninety-three".