4247209 has 2 divisors, whose sum is σ = 4247210. Its totient is φ = 4247208.

The previous prime is 4247167. The next prime is 4247227. The reversal of 4247209 is 9027424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4214809 + 32400 = 2053^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 4247209 - 2⁷ = 4247081 is a prime.

It is not a weakly prime, because it can be changed into another prime (4247609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2123604 + 2123605.

It is an arithmetic number, because the mean of its divisors is an integer number (2123605).

Almost surely, 2^4247209 is an apocalyptic number.

It is an amenable number.

4247209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4247209 is an equidigital number, since it uses as much as digits as its factorization.

4247209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 4247209 is about 2060.8757847090. The cubic root of 4247209 is about 161.9451244305.

The spelling of 4247209 in words is "four million, two hundred forty-seven thousand, two hundred nine".