420660 has 96 divisors (see below), whose sum is σ = 1411200. Its totient is φ = 103680.

The previous prime is 420613. The next prime is 420671. The reversal of 420660 is 66024.

420660 is a `hidden beast` number, since 4 + 2 + 0 + 660 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

420660 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 31 ways as a sum of consecutive naturals, for example, 10240 + ... + 10280.

It is an arithmetic number, because the mean of its divisors is an integer number (14700).

2⁴²⁰⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705600).

420660 is an abundant number, since it is smaller than the sum of its proper divisors (990540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420660 is a wasteful number, since it uses less digits than its factorization.

420660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 420660 is about 648.5830710094. The cubic root of 420660 is about 74.9279307692.

Adding to 420660 its reverse (66024), we get a palindrome (486684).

The spelling of 420660 in words is "four hundred twenty thousand, six hundred sixty".