18241909 has 4 divisors (see below), whose sum is σ = 20847904. Its totient is φ = 15635916.

The previous prime is 18241879. The next prime is 18241939. The reversal of 18241909 is 90914281.

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: 90914281 = 191 ⋅475991.

It is an interprime number because it is at equal distance from previous prime (18241879) and next prime (18241939).

It is a cyclic number.

It is not a de Polignac number, because 18241909 - 2⁹ = 18241397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18241939) 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, 1302987 + ... + 1303000.

It is an arithmetic number, because the mean of its divisors is an integer number (5211976).

Almost surely, 2^18241909 is an apocalyptic number.

It is an amenable number.

18241909 is a deficient number, since it is larger than the sum of its proper divisors (2605995).

18241909 is an equidigital number, since it uses as much as digits as its factorization.

18241909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605994.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18241909 is about 4271.0547877544. The cubic root of 18241909 is about 263.2429576459.

The spelling of 18241909 in words is "eighteen million, two hundred forty-one thousand, nine hundred nine".