420646 has 4 divisors (see below), whose sum is σ = 630972. Its totient is φ = 210322.

The previous prime is 420613. The next prime is 420671. The reversal of 420646 is 646024.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105160 + ... + 105163.

It is an arithmetic number, because the mean of its divisors is an integer number (157743).

2⁴²⁰⁶⁴⁶ is an apocalyptic number.

420646 is a deficient number, since it is larger than the sum of its proper divisors (210326).

420646 is a wasteful number, since it uses less digits than its factorization.

420646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210325.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 420646 is about 648.5722781618. The cubic root of 420646 is about 74.9270995336.

The spelling of 420646 in words is "four hundred twenty thousand, six hundred forty-six".