642422 has 8 divisors (see below), whose sum is σ = 1051272. Its totient is φ = 292000.

The previous prime is 642419. The next prime is 642427. The reversal of 642422 is 224246.

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

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 642394 and 642403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642427) 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, 14579 + ... + 14622.

It is an arithmetic number, because the mean of its divisors is an integer number (131409).

2⁶⁴²⁴²² is an apocalyptic number.

642422 is a deficient number, since it is larger than the sum of its proper divisors (408850).

642422 is a wasteful number, since it uses less digits than its factorization.

642422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29214.

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

The square root of 642422 is about 801.5123205541. The cubic root of 642422 is about 86.2859599405.

Adding to 642422 its reverse (224246), we get a palindrome (866668).

It can be divided in two parts, 6424 and 22, that added together give a palindrome (6446).

The spelling of 642422 in words is "six hundred forty-two thousand, four hundred twenty-two".