349991 has 4 divisors (see below), whose sum is σ = 365232. Its totient is φ = 334752.

The previous prime is 349981. The next prime is 350003. The reversal of 349991 is 199943.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199943 = 179 ⋅1117.

It is a cyclic number.

It is not a de Polignac number, because 349991 - 2⁶ = 349927 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 (349931) 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, 7586 + ... + 7631.

It is an arithmetic number, because the mean of its divisors is an integer number (91308).

2³⁴⁹⁹⁹¹ is an apocalyptic number.

349991 is a deficient number, since it is larger than the sum of its proper divisors (15241).

349991 is a wasteful number, since it uses less digits than its factorization.

349991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15240.

The product of its digits is 8748, while the sum is 35.

The square root of 349991 is about 591.6003718728. The cubic root of 349991 is about 70.4723832613.

It can be divided in two parts, 3 and 49991, that added together give a palindrome (49994).

The spelling of 349991 in words is "three hundred forty-nine thousand, nine hundred ninety-one".