420666 has 8 divisors (see below), whose sum is σ = 841344. Its totient is φ = 140220.

The previous prime is 420613. The next prime is 420671. The reversal of 420666 is 666024.

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

420666 is an admirable number.

420666 is a modest number, since divided by 666 gives 420 as remainder.

It is a Curzon number.

It is an unprimeable number.

420666 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, 35050 + ... + 35061.

It is an arithmetic number, because the mean of its divisors is an integer number (105168).

2⁴²⁰⁶⁶⁶ is an apocalyptic number.

420666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

420666 is a wasteful number, since it uses less digits than its factorization.

420666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70116.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 420666 is about 648.5876964605. The cubic root of 420666 is about 74.9282870074.

The spelling of 420666 in words is "four hundred twenty thousand, six hundred sixty-six".