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668989 is a prime number
BaseRepresentation
bin10100011010100111101
31020222200101
42203110331
5132401424
622201101
75454256
oct2432475
91228611
10668989
11417692
12283191
131a5669
14135b2d
15d3344
hexa353d

668989 has 2 divisors, whose sum is σ = 668990. Its totient is φ = 668988.

The previous prime is 668963. The next prime is 668999. The reversal of 668989 is 989866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466489 + 202500 = 683^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 668989 - 219 = 144701 is a prime.

668989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668929) 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, 334494 + 334495.

It is an arithmetic number, because the mean of its divisors is an integer number (334495).

2668989 is an apocalyptic number.

It is an amenable number.

668989 is a deficient number, since it is larger than the sum of its proper divisors (1).

668989 is an equidigital number, since it uses as much as digits as its factorization.

668989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 668989 is about 817.9174775000. The cubic root of 668989 is about 87.4593661671.

The spelling of 668989 in words is "six hundred sixty-eight thousand, nine hundred eighty-nine".