18009129 has 4 divisors (see below), whose sum is σ = 24012176. Its totient is φ = 12006084.

The previous prime is 18009119. The next prime is 18009133. The reversal of 18009129 is 92190081.

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.

It is not a de Polignac number, because 18009129 - 2¹³ = 18000937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18009096 and 18009105.

It is not an unprimeable number, because it can be changed into a prime (18009119) 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, 3001519 + ... + 3001524.

It is an arithmetic number, because the mean of its divisors is an integer number (6003044).

Almost surely, 2^18009129 is an apocalyptic number.

It is an amenable number.

18009129 is a deficient number, since it is larger than the sum of its proper divisors (6003047).

18009129 is an equidigital number, since it uses as much as digits as its factorization.

18009129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6003046.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 18009129 is about 4243.7164137110. The cubic root of 18009129 is about 262.1184370222.

The spelling of 18009129 in words is "eighteen million, nine thousand, one hundred twenty-nine".