420641 has 12 divisors (see below), whose sum is σ = 483120. Its totient is φ = 365040.

The previous prime is 420613. The next prime is 420671. The reversal of 420641 is 146024.

It is a de Polignac number, because none of the positive numbers 2^k-420641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (420671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3146 + ... + 3276.

It is an arithmetic number, because the mean of its divisors is an integer number (40260).

2⁴²⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

420641 is a deficient number, since it is larger than the sum of its proper divisors (62479).

420641 is a wasteful number, since it uses less digits than its factorization.

420641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 420641 is about 648.5684235299. The cubic root of 420641 is about 74.9268026593.

Adding to 420641 its reverse (146024), we get a palindrome (566665).

The spelling of 420641 in words is "four hundred twenty thousand, six hundred forty-one".