646217 has 8 divisors (see below), whose sum is σ = 759360. Its totient is φ = 542160.

The previous prime is 646199. The next prime is 646237. The reversal of 646217 is 712646.

646217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 646217 - 2¹² = 642121 is a prime.

It is a super-2 number, since 2×646217² = 835192822178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2117 + ... + 2402.

It is an arithmetic number, because the mean of its divisors is an integer number (94920).

2⁶⁴⁶²¹⁷ is an apocalyptic number.

It is an amenable number.

646217 is a deficient number, since it is larger than the sum of its proper divisors (113143).

646217 is a wasteful number, since it uses less digits than its factorization.

646217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543.

The product of its digits is 2016, while the sum is 26.

The square root of 646217 is about 803.8762342550. The cubic root of 646217 is about 86.4555330717.

The spelling of 646217 in words is "six hundred forty-six thousand, two hundred seventeen".