420651 has 24 divisors (see below), whose sum is σ = 758784. Its totient is φ = 218160.

The previous prime is 420613. The next prime is 420671. The reversal of 420651 is 156024.

It is a happy number.

It is not a de Polignac number, because 420651 - 2¹¹ = 418603 is a prime.

420651 is a lucky number.

It is a congruent number.

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

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 23 ways as a sum of consecutive naturals, for example, 390 + ... + 996.

It is an arithmetic number, because the mean of its divisors is an integer number (31616).

2⁴²⁰⁶⁵¹ is an apocalyptic number.

420651 is a deficient number, since it is larger than the sum of its proper divisors (338133).

420651 is a wasteful number, since it uses less digits than its factorization.

420651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 420651 is about 648.5761327709. The cubic root of 420651 is about 74.9273964056.

Adding to 420651 its reverse (156024), we get a palindrome (576675).

The spelling of 420651 in words is "four hundred twenty thousand, six hundred fifty-one".