621423 has 12 divisors (see below), whose sum is σ = 979368. Its totient is φ = 376560.

The previous prime is 621419. The next prime is 621427. The reversal of 621423 is 324126.

It is a happy number.

621423 is a `hidden beast` number, since 621 + 42 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (621419) and next prime (621427).

It is not a de Polignac number, because 621423 - 2² = 621419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 621396 and 621405.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621423.

It is not an unprimeable number, because it can be changed into a prime (621427) 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, 3040 + ... + 3237.

It is an arithmetic number, because the mean of its divisors is an integer number (81614).

2⁶²¹⁴²³ is an apocalyptic number.

621423 is a deficient number, since it is larger than the sum of its proper divisors (357945).

621423 is a wasteful number, since it uses less digits than its factorization.

621423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6294 (or 6291 counting only the distinct ones).

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

The square root of 621423 is about 788.3038754186. The cubic root of 621423 is about 85.3353762667.

Adding to 621423 its reverse (324126), we get a palindrome (945549).

It can be divided in two parts, 62 and 1423, that added together give a triangular number (1485 = T₅₄).

The spelling of 621423 in words is "six hundred twenty-one thousand, four hundred twenty-three".