18505249 has 4 divisors (see below), whose sum is σ = 21148864. Its totient is φ = 15861636.

The previous prime is 18505243. The next prime is 18505283. The reversal of 18505249 is 94250581.

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: 94250581 = 37 ⋅2547313.

It is not a de Polignac number, because 18505249 - 2²³ = 10116641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18505243) 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 3 ways as a sum of consecutive naturals, for example, 1321797 + ... + 1321810.

It is an arithmetic number, because the mean of its divisors is an integer number (5287216).

Almost surely, 2^18505249 is an apocalyptic number.

It is an amenable number.

18505249 is a deficient number, since it is larger than the sum of its proper divisors (2643615).

18505249 is an equidigital number, since it uses as much as digits as its factorization.

18505249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643614.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 18505249 is about 4301.7727741014. The cubic root of 18505249 is about 264.5036347522.

The spelling of 18505249 in words is "eighteen million, five hundred five thousand, two hundred forty-nine".