6442 has 4 divisors (see below), whose sum is σ = 9666.
Its totient is φ = 3220.
The previous prime is 6427. The next prime is 6449. The reversal of 6442 is 2446.
Adding to 6442 its reverse (2446), we get a palindrome (8888).
It can be divided in two parts, 644 and 2, that added together give a palindrome (646).
6442 is nontrivially palindromic in base 6.
6442 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2446 = 2 ⋅1223.
It can be written as a sum of positive squares in only one way, i.e., 4761 + 1681 = 69^2 + 41^2
It is a pancake number, because a pancake can be divided into 6442 parts by 113 straight cuts.
6442 is an undulating number in base 6.
It is a plaindrome in base 12.
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (6449) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1609 + ... + 1612.
26442 is an apocalyptic number.
6442 is a deficient number, since it is larger than the sum of its proper divisors (3224).
6442 is a wasteful number, since it uses less digits than its factorization.
6442 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3223.
The product of its digits is 192, while the sum is 16.
The square root of 6442 is about 80.2620707433.
The cubic root of 6442 is about 18.6068807163.
The spelling of 6442 in words is "six thousand, four hundred forty-two".