6642438 has 32 divisors (see below), whose sum is σ = 15258240. Its totient is φ = 1906560.

The previous prime is 6642431. The next prime is 6642439. The reversal of 6642438 is 8342466.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 6642399 and 6642408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1395 + ... + 3902.

It is an arithmetic number, because the mean of its divisors is an integer number (476820).

Almost surely, 2^6642438 is an apocalyptic number.

6642438 is an abundant number, since it is smaller than the sum of its proper divisors (8615802).

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

6642438 is a wasteful number, since it uses less digits than its factorization.

6642438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5332.

The product of its digits is 27648, while the sum is 33.

The square root of 6642438 is about 2577.2927656749. The cubic root of 6642438 is about 187.9789285271.

The spelling of 6642438 in words is "six million, six hundred forty-two thousand, four hundred thirty-eight".