4287209 has 2 divisors, whose sum is σ = 4287210. Its totient is φ = 4287208.

The previous prime is 4287197. The next prime is 4287211. The reversal of 4287209 is 9027824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3717184 + 570025 = 1928^2 + 755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4287209 is a prime.

It is a super-2 number, since 2×4287209² = 36760322019362, which contains 22 as substring.

Together with 4287211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4287289) 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, 2143604 + 2143605.

It is an arithmetic number, because the mean of its divisors is an integer number (2143605).

Almost surely, 2^4287209 is an apocalyptic number.

It is an amenable number.

4287209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4287209 is an equidigital number, since it uses as much as digits as its factorization.

4287209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 4287209 is about 2070.5576543530. The cubic root of 4287209 is about 162.4519337127.

The spelling of 4287209 in words is "four million, two hundred eighty-seven thousand, two hundred nine".