18008129 has 4 divisors (see below), whose sum is σ = 18236160. Its totient is φ = 17780100.

The previous prime is 18008113. The next prime is 18008131. The reversal of 18008129 is 92180081.

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 a cyclic number.

It is not a de Polignac number, because 18008129 - 2⁴ = 18008113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18008189) 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, 113897 + ... + 114054.

It is an arithmetic number, because the mean of its divisors is an integer number (4559040).

Almost surely, 2^18008129 is an apocalyptic number.

It is an amenable number.

18008129 is a deficient number, since it is larger than the sum of its proper divisors (228031).

18008129 is an equidigital number, since it uses as much as digits as its factorization.

18008129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228030.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 18008129 is about 4243.5985908189. The cubic root of 18008129 is about 262.1135853478.

The spelling of 18008129 in words is "eighteen million, eight thousand, one hundred twenty-nine".