309669 has 8 divisors (see below), whose sum is σ = 417120. Its totient is φ = 204336.

The previous prime is 309667. The next prime is 309671. The reversal of 309669 is 966903.

309669 = T₁₄ + T₁₅ + ... + T₁₂₂.

It is an interprime number because it is at equal distance from previous prime (309667) and next prime (309671).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 309669 - 2¹ = 309667 is a prime.

It is a super-2 number, since 2×309669² = 191789779122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147 + ... + 800.

It is an arithmetic number, because the mean of its divisors is an integer number (52140).

2³⁰⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

309669 is a deficient number, since it is larger than the sum of its proper divisors (107451).

309669 is a wasteful number, since it uses less digits than its factorization.

309669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 309669 is about 556.4791101200. The cubic root of 309669 is about 67.6548980426.

The spelling of 309669 in words is "three hundred nine thousand, six hundred sixty-nine".