420656 has 20 divisors (see below), whose sum is σ = 830304. Its totient is φ = 206400.

The previous prime is 420613. The next prime is 420671. The reversal of 420656 is 656024.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

420656 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 3 ways as a sum of consecutive naturals, for example, 761 + ... + 1191.

2⁴²⁰⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

420656 is a deficient number, since it is larger than the sum of its proper divisors (409648).

420656 is a wasteful number, since it uses less digits than its factorization.

420656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 420656 is about 648.5799873570. The cubic root of 420656 is about 74.9276932752.

The spelling of 420656 in words is "four hundred twenty thousand, six hundred fifty-six".