420923 has 4 divisors (see below), whose sum is σ = 439248. Its totient is φ = 402600.

The previous prime is 420919. The next prime is 420929. The reversal of 420923 is 329024.

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

It is a cyclic number.

It is not a de Polignac number, because 420923 - 2² = 420919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420895 and 420904.

It is not an unprimeable number, because it can be changed into a prime (420929) 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, 9128 + ... + 9173.

It is an arithmetic number, because the mean of its divisors is an integer number (109812).

2⁴²⁰⁹²³ is an apocalyptic number.

420923 is a deficient number, since it is larger than the sum of its proper divisors (18325).

420923 is a wasteful number, since it uses less digits than its factorization.

420923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18324.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 420923 is about 648.7857889936. The cubic root of 420923 is about 74.9435426968.

Subtracting from 420923 its sum of digits (20), we obtain a triangular number (420903 = T₉₁₇).

Adding to 420923 its reverse (329024), we get a palindrome (749947).

The spelling of 420923 in words is "four hundred twenty thousand, nine hundred twenty-three".