642122 has 8 divisors (see below), whose sum is σ = 1037316. Its totient is φ = 296352.

The previous prime is 642121. The next prime is 642133. The reversal of 642122 is 221246.

It can be written as a sum of positive squares in 2 ways, for example, as 638401 + 3721 = 799^2 + 61^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 642122.

It is not an unprimeable number, because it can be changed into a prime (642121) 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, 12323 + ... + 12374.

2⁶⁴²¹²² is an apocalyptic number.

642122 is a deficient number, since it is larger than the sum of its proper divisors (395194).

642122 is a wasteful number, since it uses less digits than its factorization.

642122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24712.

The product of its digits is 192, while the sum is 17.

The square root of 642122 is about 801.3251524818. The cubic root of 642122 is about 86.2725264972.

Adding to 642122 its reverse (221246), we get a palindrome (863368).

The spelling of 642122 in words is "six hundred forty-two thousand, one hundred twenty-two".