309449 has 4 divisors (see below), whose sum is σ = 353664. Its totient is φ = 265236.

The previous prime is 309437. The next prime is 309457. The reversal of 309449 is 944903.

It is a happy number.

309449 is nontrivially palindromic in base 8.

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: 944903 = 131 ⋅7213.

It is a cyclic number.

It is not a de Polignac number, because 309449 - 2⁴ = 309433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309469) 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, 22097 + ... + 22110.

It is an arithmetic number, because the mean of its divisors is an integer number (88416).

2³⁰⁹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

309449 is a deficient number, since it is larger than the sum of its proper divisors (44215).

309449 is an equidigital number, since it uses as much as digits as its factorization.

309449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44214.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 309449 is about 556.2814036079. The cubic root of 309449 is about 67.6388727557.

The spelling of 309449 in words is "three hundred nine thousand, four hundred forty-nine".