420518 has 16 divisors (see below), whose sum is σ = 736800. Its totient is φ = 179928.

The previous prime is 420503. The next prime is 420521. The reversal of 420518 is 815024.

420518 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

420518 is a modest number, since divided by 518 gives 420 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 420518.

It is a congruent number.

It is an unprimeable number.

420518 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 992.

It is an arithmetic number, because the mean of its divisors is an integer number (46050).

2⁴²⁰⁵¹⁸ is an apocalyptic number.

420518 is a deficient number, since it is larger than the sum of its proper divisors (316282).

420518 is an equidigital number, since it uses as much as digits as its factorization.

420518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 420518 is about 648.4735923690. The cubic root of 420518 is about 74.9194988102.

The spelling of 420518 in words is "four hundred twenty thousand, five hundred eighteen".