18466289 has 4 divisors (see below), whose sum is σ = 18599280. Its totient is φ = 18333300.

The previous prime is 18466249. The next prime is 18466291. The reversal of 18466289 is 98266481.

It is a happy number.

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: 98266481 = 43 ⋅2285267.

It is a cyclic number.

It is not a de Polignac number, because 18466289 - 2¹² = 18462193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18466229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66287 + ... + 66564.

It is an arithmetic number, because the mean of its divisors is an integer number (4649820).

Almost surely, 2^18466289 is an apocalyptic number.

It is an amenable number.

18466289 is a deficient number, since it is larger than the sum of its proper divisors (132991).

18466289 is a wasteful number, since it uses less digits than its factorization.

18466289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132990.

The product of its digits is 165888, while the sum is 44.

The square root of 18466289 is about 4297.2420225070. The cubic root of 18466289 is about 264.3178802131.

The spelling of 18466289 in words is "eighteen million, four hundred sixty-six thousand, two hundred eighty-nine".