420591 has 4 divisors (see below), whose sum is σ = 560792. Its totient is φ = 280392.

The previous prime is 420571. The next prime is 420593. The reversal of 420591 is 195024.

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

It is not a de Polignac number, because 420591 - 2¹⁰ = 419567 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70096 + ... + 70101.

It is an arithmetic number, because the mean of its divisors is an integer number (140198).

2⁴²⁰⁵⁹¹ is an apocalyptic number.

420591 is a deficient number, since it is larger than the sum of its proper divisors (140201).

420591 is a wasteful number, since it uses less digits than its factorization.

420591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140200.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 420591 is about 648.5298759502. The cubic root of 420591 is about 74.9238337867.

The spelling of 420591 in words is "four hundred twenty thousand, five hundred ninety-one".