421623423 has 12 divisors (see below), whose sum is σ = 655858840. Its totient is φ = 259460496.

The previous prime is 421623407. The next prime is 421623457. The reversal of 421623423 is 324326124.

421623423 is a `hidden beast` number, since 4 + 216 + 23 + 423 = 666.

It is not a de Polignac number, because 421623423 - 2⁴ = 421623407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421623403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1801693 + ... + 1801926.

Almost surely, 2^421623423 is an apocalyptic number.

421623423 is a deficient number, since it is larger than the sum of its proper divisors (234235417).

421623423 is a wasteful number, since it uses less digits than its factorization.

421623423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603638 (or 3603635 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 421623423 is about 20533.4707977000. The cubic root of 421623423 is about 749.8508876893.

Adding to 421623423 its reverse (324326124), we get a palindrome (745949547).

The spelling of 421623423 in words is "four hundred twenty-one million, six hundred twenty-three thousand, four hundred twenty-three".