18047129 has 4 divisors (see below), whose sum is σ = 18122880. Its totient is φ = 17971380.

The previous prime is 18047089. The next prime is 18047173. The reversal of 18047129 is 92174081.

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: 92174081 = 179 ⋅514939.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18047129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18047095 and 18047104.

It is not an unprimeable number, because it can be changed into a prime (18047179) 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, 37517 + ... + 37994.

It is an arithmetic number, because the mean of its divisors is an integer number (4530720).

Almost surely, 2^18047129 is an apocalyptic number.

It is an amenable number.

18047129 is a deficient number, since it is larger than the sum of its proper divisors (75751).

18047129 is an equidigital number, since it uses as much as digits as its factorization.

18047129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75750.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18047129 is about 4248.1912621726. The cubic root of 18047129 is about 262.3026677184.

The spelling of 18047129 in words is "eighteen million, forty-seven thousand, one hundred twenty-nine".