6405623 has 12 divisors (see below), whose sum is σ = 7693632. Its totient is φ = 5312160.

The previous prime is 6405593. The next prime is 6405629. The reversal of 6405623 is 3265046.

6405623 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6405623 - 2⁶ = 6405559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6405592 and 6405601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6405629) 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, 590 + ... + 3627.

It is an arithmetic number, because the mean of its divisors is an integer number (641136).

Almost surely, 2^6405623 is an apocalyptic number.

6405623 is a deficient number, since it is larger than the sum of its proper divisors (1288009).

6405623 is a wasteful number, since it uses less digits than its factorization.

6405623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262 (or 4255 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 6405623 is about 2530.9332270923. The cubic root of 6405623 is about 185.7179117072.

The spelling of 6405623 in words is "six million, four hundred five thousand, six hundred twenty-three".