420505 has 8 divisors (see below), whose sum is σ = 518472. Its totient is φ = 327168.

The previous prime is 420503. The next prime is 420521. The reversal of 420505 is 505024.

It is a happy number.

420505 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 4 ways, for example, as 205209 + 215296 = 453^2 + 464^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420505 - 2¹ = 420503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (64809).

2⁴²⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

420505 is a deficient number, since it is larger than the sum of its proper divisors (97967).

420505 is a wasteful number, since it uses less digits than its factorization.

420505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315.

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 420505 is about 648.4635687531. The cubic root of 420505 is about 74.9187267755.

Adding to 420505 its reverse (505024), we get a palindrome (925529).

The spelling of 420505 in words is "four hundred twenty thousand, five hundred five".