18282409 has 4 divisors (see below), whose sum is σ = 18293904. Its totient is φ = 18270916.

The previous prime is 18282391. The next prime is 18282413. The reversal of 18282409 is 90428281.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90428281 = 499 ⋅181219.

It is a cyclic number.

It is not a de Polignac number, because 18282409 - 2⁵ = 18282377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18282479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887 + ... + 6700.

It is an arithmetic number, because the mean of its divisors is an integer number (4573476).

Almost surely, 2^18282409 is an apocalyptic number.

It is an amenable number.

18282409 is a deficient number, since it is larger than the sum of its proper divisors (11495).

18282409 is an equidigital number, since it uses as much as digits as its factorization.

18282409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11494.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18282409 is about 4275.7933766729. The cubic root of 18282409 is about 263.4376276872.

The spelling of 18282409 in words is "eighteen million, two hundred eighty-two thousand, four hundred nine".