18409441 has 4 divisors (see below), whose sum is σ = 18424000. Its totient is φ = 18394884.

The previous prime is 18409439. The next prime is 18409459. The reversal of 18409441 is 14490481.

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: 14490481 = 251 ⋅57731.

It is a cyclic number.

It is not a de Polignac number, because 18409441 - 2¹ = 18409439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18409421) 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, 5181 + ... + 7978.

It is an arithmetic number, because the mean of its divisors is an integer number (4606000).

Almost surely, 2^18409441 is an apocalyptic number.

It is an amenable number.

18409441 is a deficient number, since it is larger than the sum of its proper divisors (14559).

18409441 is a wasteful number, since it uses less digits than its factorization.

18409441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14558.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18409441 is about 4290.6224490160. The cubic root of 18409441 is about 264.0463694569.

The spelling of 18409441 in words is "eighteen million, four hundred nine thousand, four hundred forty-one".