347989 has 2 divisors, whose sum is σ = 347990. Its totient is φ = 347988.

The previous prime is 347987. The next prime is 347993. The reversal of 347989 is 989743.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 339889 + 8100 = 583^2 + 90^2 .

It is an emirp because it is prime and its reverse (989743) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 347989 - 2¹ = 347987 is a prime.

Together with 347987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (347981) 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 as a sum of consecutive naturals, namely, 173994 + 173995.

It is an arithmetic number, because the mean of its divisors is an integer number (173995).

2³⁴⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

347989 is a deficient number, since it is larger than the sum of its proper divisors (1).

347989 is an equidigital number, since it uses as much as digits as its factorization.

347989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 347989 is about 589.9059247033. The cubic root of 347989 is about 70.3377554377.

The spelling of 347989 in words is "three hundred forty-seven thousand, nine hundred eighty-nine".