420623 has 4 divisors (see below), whose sum is σ = 480720. Its totient is φ = 360528.

The previous prime is 420613. The next prime is 420671. The reversal of 420623 is 326024.

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

It is not a de Polignac number, because 420623 - 2⁸ = 420367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420613) 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 3 ways as a sum of consecutive naturals, for example, 30038 + ... + 30051.

It is an arithmetic number, because the mean of its divisors is an integer number (120180).

2⁴²⁰⁶²³ is an apocalyptic number.

420623 is a deficient number, since it is larger than the sum of its proper divisors (60097).

420623 is an equidigital number, since it uses as much as digits as its factorization.

420623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60096.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 420623 is about 648.5545466651. The cubic root of 420623 is about 74.9257338923.

Adding to 420623 its reverse (326024), we get a palindrome (746647).

The spelling of 420623 in words is "four hundred twenty thousand, six hundred twenty-three".