347999 has 4 divisors (see below), whose sum is σ = 356136. Its totient is φ = 339864.

The previous prime is 347993. The next prime is 348001. The reversal of 347999 is 999743.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999743 = 653 ⋅1531.

It is a cyclic number.

It is not a de Polignac number, because 347999 - 2⁴ = 347983 is a prime.

It is a super-2 number, since 2×347999² = 242206608002, which contains 22 as substring.

It is a Duffinian number.

347999 is a modest number, since divided by 999 gives 347 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (347993) 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, 4004 + ... + 4089.

It is an arithmetic number, because the mean of its divisors is an integer number (89034).

2³⁴⁷⁹⁹⁹ is an apocalyptic number.

347999 is a deficient number, since it is larger than the sum of its proper divisors (8137).

347999 is an equidigital number, since it uses as much as digits as its factorization.

347999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8136.

The product of its digits is 61236, while the sum is 41.

The square root of 347999 is about 589.9144005701. The cubic root of 347999 is about 70.3384291859.

The spelling of 347999 in words is "three hundred forty-seven thousand, nine hundred ninety-nine".