6400423 has 2 divisors, whose sum is σ = 6400424. Its totient is φ = 6400422.

The previous prime is 6400411. The next prime is 6400451. The reversal of 6400423 is 3240046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6400423 - 2⁵ = 6400391 is a prime.

6400423 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6400423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200211 + 3200212.

It is an arithmetic number, because the mean of its divisors is an integer number (3200212).

Almost surely, 2^6400423 is an apocalyptic number.

6400423 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400423 is an equidigital number, since it uses as much as digits as its factorization.

6400423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 6400423 is about 2529.9057294690. The cubic root of 6400423 is about 185.6676436546.

Adding to 6400423 its reverse (3240046), we get a palindrome (9640469).

The spelling of 6400423 in words is "six million, four hundred thousand, four hundred twenty-three".