349309 has 4 divisors (see below), whose sum is σ = 351616. Its totient is φ = 347004.

The previous prime is 349303. The next prime is 349313. The reversal of 349309 is 903943.

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: 903943 = 97 ⋅9319.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349309 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 (349303) 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 in 3 ways as a sum of consecutive naturals, for example, 909 + ... + 1234.

It is an arithmetic number, because the mean of its divisors is an integer number (87904).

2³⁴⁹³⁰⁹ is an apocalyptic number.

It is an amenable number.

349309 is a deficient number, since it is larger than the sum of its proper divisors (2307).

349309 is a wasteful number, since it uses less digits than its factorization.

349309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 349309 is about 591.0236881886. The cubic root of 349309 is about 70.4265788287.

Subtracting from 349309 its sum of digits (28), we obtain a square (349281 = 591²).

The spelling of 349309 in words is "three hundred forty-nine thousand, three hundred nine".