18244261 has 8 divisors (see below), whose sum is σ = 20887424. Its totient is φ = 15610320.

The previous prime is 18244253. The next prime is 18244279. The reversal of 18244261 is 16244281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18244261 - 2³ = 18244253 is a prime.

It is a super-2 number, since 2×18244261² = 665706118872242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18244211) 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 7 ways as a sum of consecutive naturals, for example, 2656 + ... + 6598.

It is an arithmetic number, because the mean of its divisors is an integer number (2610928).

Almost surely, 2^18244261 is an apocalyptic number.

It is an amenable number.

18244261 is a deficient number, since it is larger than the sum of its proper divisors (2643163).

18244261 is an equidigital number, since it uses as much as digits as its factorization.

18244261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4611.

The product of its digits is 3072, while the sum is 28.

The square root of 18244261 is about 4271.3301207001. The cubic root of 18244261 is about 263.2542708045.

The spelling of 18244261 in words is "eighteen million, two hundred forty-four thousand, two hundred sixty-one".