349909 has 12 divisors (see below), whose sum is σ = 420204. Its totient is φ = 290304.

The previous prime is 349907. The next prime is 349913. The reversal of 349909 is 909943.

It can be written as a sum of positive squares in 2 ways, for example, as 207025 + 142884 = 455^2 + 378^2 .

It is not a de Polignac number, because 349909 - 2¹ = 349907 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 (349903) 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 11 ways as a sum of consecutive naturals, for example, 1717 + ... + 1909.

It is an arithmetic number, because the mean of its divisors is an integer number (35017).

2³⁴⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

349909 is a deficient number, since it is larger than the sum of its proper divisors (70295).

349909 is a wasteful number, since it uses less digits than its factorization.

349909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 349909 is about 591.5310642730. The cubic root of 349909 is about 70.4668791323.

Adding to 349909 its sum of digits (34), we get a palindrome (349943).

The spelling of 349909 in words is "three hundred forty-nine thousand, nine hundred nine".