420818 has 8 divisors (see below), whose sum is σ = 668412. Its totient is φ = 198016.

The previous prime is 420811. The next prime is 420851. The reversal of 420818 is 818024.

420818 is nontrivially palindromic in base 15.

420818 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 418609 + 2209 = 647^2 + 47^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 420793 and 420802.

It is not an unprimeable number, because it can be changed into a prime (420811) by changing a digit.

420818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 6155 + ... + 6222.

2⁴²⁰⁸¹⁸ is an apocalyptic number.

420818 is a deficient number, since it is larger than the sum of its proper divisors (247594).

420818 is a wasteful number, since it uses less digits than its factorization.

420818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12396.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 420818 is about 648.7048635551. The cubic root of 420818 is about 74.9373105780.

The spelling of 420818 in words is "four hundred twenty thousand, eight hundred eighteen".