349890689 has 2 divisors, whose sum is σ = 349890690. Its totient is φ = 349890688.

The previous prime is 349890677. The next prime is 349890727. The reversal of 349890689 is 986098943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 324720400 + 25170289 = 18020^2 + 5017^2 .

It is a cyclic number.

It is not a de Polignac number, because 349890689 - 2¹⁶ = 349825153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (349890649) 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 as a sum of consecutive naturals, namely, 174945344 + 174945345.

It is an arithmetic number, because the mean of its divisors is an integer number (174945345).

Almost surely, 2^349890689 is an apocalyptic number.

It is an amenable number.

349890689 is a deficient number, since it is larger than the sum of its proper divisors (1).

349890689 is an equidigital number, since it uses as much as digits as its factorization.

349890689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The square root of 349890689 is about 18705.3652463672. The cubic root of 349890689 is about 704.6564991605.

The spelling of 349890689 in words is "three hundred forty-nine million, eight hundred ninety thousand, six hundred eighty-nine".