305249 has 4 divisors (see below), whose sum is σ = 348864. Its totient is φ = 261636.

The previous prime is 305243. The next prime is 305267. The reversal of 305249 is 942503.

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: 942503 = 73 ⋅12911.

It is a cyclic number.

It is not a de Polignac number, because 305249 - 2¹² = 301153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (305243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21797 + ... + 21810.

It is an arithmetic number, because the mean of its divisors is an integer number (87216).

2³⁰⁵²⁴⁹ is an apocalyptic number.

It is an amenable number.

305249 is a deficient number, since it is larger than the sum of its proper divisors (43615).

305249 is an equidigital number, since it uses as much as digits as its factorization.

305249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43614.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 305249 is about 552.4934388751. The cubic root of 305249 is about 67.3314679961.

The spelling of 305249 in words is "three hundred five thousand, two hundred forty-nine".