6442538 has 4 divisors (see below), whose sum is σ = 9663810. Its totient is φ = 3221268.

The previous prime is 6442531. The next prime is 6442559. The reversal of 6442538 is 8352446.

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

It can be written as a sum of positive squares in only one way, i.e., 5697769 + 744769 = 2387^2 + 863^2 .

It is not an unprimeable number, because it can be changed into a prime (6442531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610633 + ... + 1610636.

Almost surely, 2^6442538 is an apocalyptic number.

6442538 is a deficient number, since it is larger than the sum of its proper divisors (3221272).

6442538 is a wasteful number, since it uses less digits than its factorization.

6442538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221271.

The product of its digits is 23040, while the sum is 32.

The square root of 6442538 is about 2538.2155148844. The cubic root of 6442538 is about 186.0739868296.

The spelling of 6442538 in words is "six million, four hundred forty-two thousand, five hundred thirty-eight".