349809 has 16 divisors (see below), whose sum is σ = 521280. Its totient is φ = 207936.

The previous prime is 349801. The next prime is 349813. The reversal of 349809 is 908943.

It is not a de Polignac number, because 349809 - 2³ = 349801 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 349809.

It is not an unprimeable number, because it can be changed into a prime (349801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18402 + ... + 18420.

It is an arithmetic number, because the mean of its divisors is an integer number (32580).

2³⁴⁹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

349809 is a deficient number, since it is larger than the sum of its proper divisors (171471).

349809 is an equidigital number, since it uses as much as digits as its factorization.

349809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 349809 is about 591.4465318184. The cubic root of 349809 is about 70.4601656161.

The spelling of 349809 in words is "three hundred forty-nine thousand, eight hundred nine".