646122 has 8 divisors (see below), whose sum is σ = 1292256. Its totient is φ = 215372.

The previous prime is 646103. The next prime is 646147. The reversal of 646122 is 221646.

It is a happy number.

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

646122 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646122.

It is an unprimeable number.

646122 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53838 + ... + 53849.

It is an arithmetic number, because the mean of its divisors is an integer number (161532).

2⁶⁴⁶¹²² is an apocalyptic number.

646122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646122 is a wasteful number, since it uses less digits than its factorization.

646122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107692.

The product of its digits is 576, while the sum is 21.

The square root of 646122 is about 803.8171433852. The cubic root of 646122 is about 86.4512962709.

Subtracting from 646122 its product of digits (576), we obtain a palindrome (645546).

Adding to 646122 its reverse (221646), we get a palindrome (867768).

The spelling of 646122 in words is "six hundred forty-six thousand, one hundred twenty-two".