349820 has 12 divisors (see below), whose sum is σ = 734664. Its totient is φ = 139920.

The previous prime is 349819. The next prime is 349829. The reversal of 349820 is 28943.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 349820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349829) 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, 8726 + ... + 8765.

It is an arithmetic number, because the mean of its divisors is an integer number (61222).

2³⁴⁹⁸²⁰ is an apocalyptic number.

It is an amenable number.

349820 is an abundant number, since it is smaller than the sum of its proper divisors (384844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

349820 is a wasteful number, since it uses less digits than its factorization.

349820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17500 (or 17498 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 349820 is about 591.4558309798. The cubic root of 349820 is about 70.4609041655.

The spelling of 349820 in words is "three hundred forty-nine thousand, eight hundred twenty".