18441009 has 12 divisors (see below), whose sum is σ = 27795456. Its totient is φ = 11759352.

The previous prime is 18440999. The next prime is 18441019. The reversal of 18441009 is 90014481.

It is an interprime number because it is at equal distance from previous prime (18440999) and next prime (18441019).

It is not a de Polignac number, because 18441009 - 2⁴ = 18440993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18441019) 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 11 ways as a sum of consecutive naturals, for example, 44337 + ... + 44750.

It is an arithmetic number, because the mean of its divisors is an integer number (2316288).

Almost surely, 2^18441009 is an apocalyptic number.

It is an amenable number.

18441009 is a deficient number, since it is larger than the sum of its proper divisors (9354447).

18441009 is a wasteful number, since it uses less digits than its factorization.

18441009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89116 (or 89113 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18441009 is about 4294.2995936474. The cubic root of 18441009 is about 264.1972097400.

The spelling of 18441009 in words is "eighteen million, four hundred forty-one thousand, nine".