420671 has 2 divisors, whose sum is σ = 420672. Its totient is φ = 420670.

The previous prime is 420613. The next prime is 420677. The reversal of 420671 is 176024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420671 - 2¹⁸ = 158527 is a prime.

It is a super-3 number, since 3×420671³ = 223330982417315133, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210335 + 210336.

It is an arithmetic number, because the mean of its divisors is an integer number (210336).

2⁴²⁰⁶⁷¹ is an apocalyptic number.

420671 is a deficient number, since it is larger than the sum of its proper divisors (1).

420671 is an equidigital number, since it uses as much as digits as its factorization.

420671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 420671 is about 648.5915509780. The cubic root of 420671 is about 74.9285838699.

Adding to 420671 its reverse (176024), we get a palindrome (596695).

The spelling of 420671 in words is "four hundred twenty thousand, six hundred seventy-one".