309469 has 2 divisors, whose sum is σ = 309470. Its totient is φ = 309468.

The previous prime is 309461. The next prime is 309479. The reversal of 309469 is 964903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308025 + 1444 = 555^2 + 38^2 .

It is a cyclic number.

It is not a de Polignac number, because 309469 - 2³ = 309461 is a prime.

It is a super-2 number, since 2×309469² = 191542123922, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3³ + 0 + 4⁷ + 9⁴ + 6⁷ + 9⁴ .

It is a self number, because there is not a number n which added to its sum of digits gives 309469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154734 + 154735.

It is an arithmetic number, because the mean of its divisors is an integer number (154735).

2³⁰⁹⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

309469 is a deficient number, since it is larger than the sum of its proper divisors (1).

309469 is an equidigital number, since it uses as much as digits as its factorization.

309469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 309469 is about 556.2993798307. The cubic root of 309469 is about 67.6403299137.

The spelling of 309469 in words is "three hundred nine thousand, four hundred sixty-nine".