421623 has 12 divisors (see below), whose sum is σ = 617760. Its totient is φ = 277056.

The previous prime is 421621. The next prime is 421633. The reversal of 421623 is 326124.

It is a happy number.

421623 is a `hidden beast` number, since 42 + 1 + 623 = 666.

It is not a de Polignac number, because 421623 - 2¹ = 421621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421596 and 421605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 415 + ... + 1007.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2⁴²¹⁶²³ is an apocalyptic number.

421623 is a deficient number, since it is larger than the sum of its proper divisors (196137).

421623 is a wasteful number, since it uses less digits than its factorization.

421623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 675 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 421623 is about 649.3250341701. The cubic root of 421623 is about 74.9850636923.

Adding to 421623 its reverse (326124), we get a palindrome (747747).

The spelling of 421623 in words is "four hundred twenty-one thousand, six hundred twenty-three".