642242 has 8 divisors (see below), whose sum is σ = 967356. Its totient is φ = 319792.

The previous prime is 642241. The next prime is 642247. The reversal of 642242 is 242246.

It can be written as a sum of positive squares in 2 ways, for example, as 410881 + 231361 = 641^2 + 481^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 128 + ... + 1140.

2⁶⁴²²⁴² is an apocalyptic number.

642242 is a deficient number, since it is larger than the sum of its proper divisors (325114).

642242 is a wasteful number, since it uses less digits than its factorization.

642242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its digits is 768, while the sum is 20.

The square root of 642242 is about 801.4000249563. The cubic root of 642242 is about 86.2779003765.

Adding to 642242 its reverse (242246), we get a palindrome (884488).

The spelling of 642242 in words is "six hundred forty-two thousand, two hundred forty-two".