343893989 has 2 divisors, whose sum is σ = 343893990. Its totient is φ = 343893988.

The previous prime is 343893973. The next prime is 343893997. The reversal of 343893989 is 989398343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317196100 + 26697889 = 17810^2 + 5167^2 .

It is a cyclic number.

It is not a de Polignac number, because 343893989 - 2⁴ = 343893973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343893929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171946994 + 171946995.

It is an arithmetic number, because the mean of its divisors is an integer number (171946995).

Almost surely, 2^343893989 is an apocalyptic number.

It is an amenable number.

343893989 is a deficient number, since it is larger than the sum of its proper divisors (1).

343893989 is an equidigital number, since it uses as much as digits as its factorization.

343893989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 56.

The square root of 343893989 is about 18544.3789057493. The cubic root of 343893989 is about 700.6076281840.

The spelling of 343893989 in words is "three hundred forty-three million, eight hundred ninety-three thousand, nine hundred eighty-nine".