420008287 has 2 divisors, whose sum is σ = 420008288. Its totient is φ = 420008286.

The previous prime is 420008279. The next prime is 420008291. The reversal of 420008287 is 782800024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420008287 - 2³ = 420008279 is a prime.

It is a super-2 number, since 2×420008287² = 352813922297348738, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420008227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210004143 + 210004144.

It is an arithmetic number, because the mean of its divisors is an integer number (210004144).

Almost surely, 2^420008287 is an apocalyptic number.

420008287 is a deficient number, since it is larger than the sum of its proper divisors (1).

420008287 is an equidigital number, since it uses as much as digits as its factorization.

420008287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 420008287 is about 20494.1037130195. The cubic root of 420008287 is about 748.8921641089.

The spelling of 420008287 in words is "four hundred twenty million, eight thousand, two hundred eighty-seven".