642441 has 4 divisors (see below), whose sum is σ = 856592. Its totient is φ = 428292.

The previous prime is 642427. The next prime is 642457. The reversal of 642441 is 144246.

642441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 642441 - 2⁹ = 641929 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107071 + ... + 107076.

It is an arithmetic number, because the mean of its divisors is an integer number (214148).

2⁶⁴²⁴⁴¹ is an apocalyptic number.

It is an amenable number.

642441 is a deficient number, since it is larger than the sum of its proper divisors (214151).

642441 is a wasteful number, since it uses less digits than its factorization.

642441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214150.

The product of its digits is 768, while the sum is 21.

The square root of 642441 is about 801.5241730603. The cubic root of 642441 is about 86.2868105844.

Adding to 642441 its reverse (144246), we get a palindrome (786687).

The spelling of 642441 in words is "six hundred forty-two thousand, four hundred forty-one".