420636 has 12 divisors (see below), whose sum is σ = 981512. Its totient is φ = 140208.

The previous prime is 420613. The next prime is 420671. The reversal of 420636 is 636024.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

420636 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, 17515 + ... + 17538.

2⁴²⁰⁶³⁶ is an apocalyptic number.

It is an amenable number.

420636 is an abundant number, since it is smaller than the sum of its proper divisors (560876).

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

420636 is a wasteful number, since it uses less digits than its factorization.

420636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35060 (or 35058 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 420636 is about 648.5645688750. The cubic root of 420636 is about 74.9265057826.

The spelling of 420636 in words is "four hundred twenty thousand, six hundred thirty-six".