6438742 has 4 divisors (see below), whose sum is σ = 9658116. Its totient is φ = 3219370.

The previous prime is 6438721. The next prime is 6438749. The reversal of 6438742 is 2478346.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 6438698 and 6438707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1609684 + ... + 1609687.

It is an arithmetic number, because the mean of its divisors is an integer number (2414529).

Almost surely, 2^6438742 is an apocalyptic number.

6438742 is a deficient number, since it is larger than the sum of its proper divisors (3219374).

6438742 is a wasteful number, since it uses less digits than its factorization.

6438742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219373.

The product of its digits is 32256, while the sum is 34.

The square root of 6438742 is about 2537.4676352616. The cubic root of 6438742 is about 186.0374341736.

The spelling of 6438742 in words is "six million, four hundred thirty-eight thousand, seven hundred forty-two".