6423640 has 16 divisors (see below), whose sum is σ = 14453280. Its totient is φ = 2569440.

The previous prime is 6423629. The next prime is 6423643. The reversal of 6423640 is 463246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6423643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80256 + ... + 80335.

It is an arithmetic number, because the mean of its divisors is an integer number (903330).

Almost surely, 2^6423640 is an apocalyptic number.

It is an amenable number.

6423640 is an abundant number, since it is smaller than the sum of its proper divisors (8029640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6423640 is a wasteful number, since it uses less digits than its factorization.

6423640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160602 (or 160598 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 6423640 is about 2534.4900867827. The cubic root of 6423640 is about 185.8918707091.

Adding to 6423640 its reverse (463246), we get a palindrome (6886886).

The spelling of 6423640 in words is "six million, four hundred twenty-three thousand, six hundred forty".