646422 has 16 divisors (see below), whose sum is σ = 1477632. Its totient is φ = 184680.

The previous prime is 646421. The next prime is 646423. The reversal of 646422 is 224646.

It is an interprime number because it is at equal distance from previous prime (646421) and next prime (646423).

It is a super-2 number, since 2×646422² = 835722804168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646392 and 646401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7654 + ... + 7737.

It is an arithmetic number, because the mean of its divisors is an integer number (92352).

2⁶⁴⁶⁴²² is an apocalyptic number.

646422 is an abundant number, since it is smaller than the sum of its proper divisors (831210).

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

646422 is a wasteful number, since it uses less digits than its factorization.

646422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15403.

The product of its digits is 2304, while the sum is 24.

The square root of 646422 is about 804.0037313346. The cubic root of 646422 is about 86.4646742273.

The spelling of 646422 in words is "six hundred forty-six thousand, four hundred twenty-two".