349691 has 4 divisors (see below), whose sum is σ = 351384. Its totient is φ = 348000.

The previous prime is 349667. The next prime is 349697. The reversal of 349691 is 196943.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196943 = 31 ⋅6353.

It is a cyclic number.

It is not a de Polignac number, because 349691 - 2¹⁸ = 87547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 349691.

It is not an unprimeable number, because it can be changed into a prime (349697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 966.

It is an arithmetic number, because the mean of its divisors is an integer number (87846).

2³⁴⁹⁶⁹¹ is an apocalyptic number.

349691 is a deficient number, since it is larger than the sum of its proper divisors (1693).

349691 is a wasteful number, since it uses less digits than its factorization.

349691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692.

The product of its digits is 5832, while the sum is 32.

The square root of 349691 is about 591.3467679797. The cubic root of 349691 is about 70.4522420210.

It can be divided in two parts, 3 and 49691, that added together give a palindrome (49694).

The spelling of 349691 in words is "three hundred forty-nine thousand, six hundred ninety-one".