309229 has 4 divisors (see below), whose sum is σ = 311040. Its totient is φ = 307420.

The previous prime is 309223. The next prime is 309241. The reversal of 309229 is 922903.

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: 922903 = 109 ⋅8467.

It is a cyclic number.

It is not a de Polignac number, because 309229 - 2¹⁵ = 276461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309223) 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, 619 + ... + 1000.

It is an arithmetic number, because the mean of its divisors is an integer number (77760).

2³⁰⁹²²⁹ is an apocalyptic number.

It is an amenable number.

309229 is a deficient number, since it is larger than the sum of its proper divisors (1811).

309229 is a wasteful number, since it uses less digits than its factorization.

309229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 309229 is about 556.0836268045. The cubic root of 309229 is about 67.6228398716.

The spelling of 309229 in words is "three hundred nine thousand, two hundred twenty-nine".