4220287 has 2 divisors, whose sum is σ = 4220288. Its totient is φ = 4220286.

The previous prime is 4220269. The next prime is 4220297. The reversal of 4220287 is 7820224.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4220287 is a prime.

4220287 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4220207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110143 + 2110144.

It is an arithmetic number, because the mean of its divisors is an integer number (2110144).

Almost surely, 2^4220287 is an apocalyptic number.

4220287 is a deficient number, since it is larger than the sum of its proper divisors (1).

4220287 is an equidigital number, since it uses as much as digits as its factorization.

4220287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 4220287 is about 2054.3337119368. Note that the first 3 decimals coincide. The cubic root of 4220287 is about 161.6022222802.

The spelling of 4220287 in words is "four million, two hundred twenty thousand, two hundred eighty-seven".