2218709 has 2 divisors, whose sum is σ = 2218710. Its totient is φ = 2218708.

The previous prime is 2218691. The next prime is 2218751. The reversal of 2218709 is 9078122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2184484 + 34225 = 1478^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218709 - 2²⁰ = 1170133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2218609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109354 + 1109355.

It is an arithmetic number, because the mean of its divisors is an integer number (1109355).

2^2218709 is an apocalyptic number.

It is an amenable number.

2218709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218709 is an equidigital number, since it uses as much as digits as its factorization.

2218709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2218709 is about 1489.5331483388. The cubic root of 2218709 is about 130.4267827670.

The spelling of 2218709 in words is "two million, two hundred eighteen thousand, seven hundred nine".