349681 has 4 divisors (see below), whose sum is σ = 353700. Its totient is φ = 345664.

The previous prime is 349667. The next prime is 349697. The reversal of 349681 is 186943.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186943 = 71 ⋅2633.

It can be written as a sum of positive squares in 2 ways, for example, as 58081 + 291600 = 241^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 349681 - 2⁷ = 349553 is a prime.

It is a super-2 number, since 2×349681² = 244553603522, which contains 22 as substring.

It is a Duffinian number.

349681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (349081) 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, 1876 + ... + 2053.

It is an arithmetic number, because the mean of its divisors is an integer number (88425).

2³⁴⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

349681 is a deficient number, since it is larger than the sum of its proper divisors (4019).

349681 is an equidigital number, since it uses as much as digits as its factorization.

349681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4018.

The product of its digits is 5184, while the sum is 31.

The square root of 349681 is about 591.3383126434. The cubic root of 349681 is about 70.4515704480.

It can be divided in two parts, 34968 and 1, that added together give a square (34969 = 187²).

The spelling of 349681 in words is "three hundred forty-nine thousand, six hundred eighty-one".