309369 has 4 divisors (see below), whose sum is σ = 412496. Its totient is φ = 206244.

The previous prime is 309367. The next prime is 309371. The reversal of 309369 is 963903.

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: 963903 = 3 ⋅321301.

It is an interprime number because it is at equal distance from previous prime (309367) and next prime (309371).

It is not a de Polignac number, because 309369 - 2¹ = 309367 is a prime.

It is a super-2 number, since 2×309369² = 191418356322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309369.

It is not an unprimeable number, because it can be changed into a prime (309367) 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, 51559 + ... + 51564.

It is an arithmetic number, because the mean of its divisors is an integer number (103124).

2³⁰⁹³⁶⁹ is an apocalyptic number.

It is an amenable number.

309369 is a deficient number, since it is larger than the sum of its proper divisors (103127).

309369 is a wasteful number, since it uses less digits than its factorization.

309369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103126.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 309369 is about 556.2094929071. The cubic root of 309369 is about 67.6330434955.

The spelling of 309369 in words is "three hundred nine thousand, three hundred sixty-nine".