309123 has 12 divisors (see below), whose sum is σ = 462280. Its totient is φ = 204156.

The previous prime is 309121. The next prime is 309131. The reversal of 309123 is 321903.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 309123 - 2¹ = 309121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 309096 and 309105.

It is not an unprimeable number, because it can be changed into a prime (309121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2836 + ... + 2942.

2³⁰⁹¹²³ is an apocalyptic number.

309123 is a deficient number, since it is larger than the sum of its proper divisors (153157).

309123 is an equidigital number, since it uses as much as digits as its factorization.

309123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 309123 is about 555.9883092296. The cubic root of 309123 is about 67.6151122219.

The spelling of 309123 in words is "three hundred nine thousand, one hundred twenty-three".