642022 has 16 divisors (see below), whose sum is σ = 1065312. Its totient is φ = 288640.

The previous prime is 642013. The next prime is 642049. The reversal of 642022 is 220246.

It is a junction number, because it is equal to n+sod(n) for n = 641987 and 642005.

It is a congruent number.

It is an unprimeable number.

642022 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372 + ... + 1192.

It is an arithmetic number, because the mean of its divisors is an integer number (66582).

2⁶⁴²⁰²² is an apocalyptic number.

642022 is a deficient number, since it is larger than the sum of its proper divisors (423290).

642022 is a wasteful number, since it uses less digits than its factorization.

642022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 642022 is about 801.2627534086. The cubic root of 642022 is about 86.2680477530.

Adding to 642022 its reverse (220246), we get a palindrome (862268).

The spelling of 642022 in words is "six hundred forty-two thousand, twenty-two".