420555 has 24 divisors (see below), whose sum is σ = 716688. Its totient is φ = 210496.

The previous prime is 420551. The next prime is 420557. The reversal of 420555 is 555024.

It is not a de Polignac number, because 420555 - 2² = 420551 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

420555 is a modest number, since divided by 555 gives 420 as remainder.

420555 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (420551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7909 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (29862).

2⁴²⁰⁵⁵⁵ is an apocalyptic number.

420555 is a deficient number, since it is larger than the sum of its proper divisors (296133).

420555 is a wasteful number, since it uses less digits than its factorization.

420555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 420555 is about 648.5021202741. The cubic root of 420555 is about 74.9216960528.

Adding to 420555 its reverse (555024), we get a palindrome (975579).

The spelling of 420555 in words is "four hundred twenty thousand, five hundred fifty-five".