18366241 has 4 divisors (see below), whose sum is σ = 18640432. Its totient is φ = 18092052.

The previous prime is 18366233. The next prime is 18366253. The reversal of 18366241 is 14266381.

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: 14266381 = 53 ⋅269177.

It is a cyclic number.

It is not a de Polignac number, because 18366241 - 2³ = 18366233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18066241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136995 + ... + 137128.

It is an arithmetic number, because the mean of its divisors is an integer number (4660108).

Almost surely, 2^18366241 is an apocalyptic number.

It is an amenable number.

18366241 is a deficient number, since it is larger than the sum of its proper divisors (274191).

18366241 is an equidigital number, since it uses as much as digits as its factorization.

18366241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274190.

The product of its digits is 6912, while the sum is 31.

The square root of 18366241 is about 4285.5852575815. The cubic root of 18366241 is about 263.8396686795.

The spelling of 18366241 in words is "eighteen million, three hundred sixty-six thousand, two hundred forty-one".