420455 has 16 divisors (see below), whose sum is σ = 592704. Its totient is φ = 280320.

The previous prime is 420439. The next prime is 420457. The reversal of 420455 is 554024.

It is a happy number.

It is not a de Polignac number, because 420455 - 2⁴ = 420439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420457) 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 15 ways as a sum of consecutive naturals, for example, 1289 + ... + 1581.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁴²⁰⁴⁵⁵ is an apocalyptic number.

420455 is a deficient number, since it is larger than the sum of its proper divisors (172249).

420455 is a wasteful number, since it uses less digits than its factorization.

420455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 420455 is about 648.4250149400. The cubic root of 420455 is about 74.9157572628.

Adding to 420455 its reverse (554024), we get a palindrome (974479).

The spelling of 420455 in words is "four hundred twenty thousand, four hundred fifty-five".