646418 has 8 divisors (see below), whose sum is σ = 1020720. Its totient is φ = 306180.

The previous prime is 646411. The next prime is 646421. The reversal of 646418 is 814646.

646418 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 an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646418.

It is not an unprimeable number, because it can be changed into a prime (646411) by changing a digit.

646418 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 3 ways as a sum of consecutive naturals, for example, 8468 + ... + 8543.

It is an arithmetic number, because the mean of its divisors is an integer number (127590).

2⁶⁴⁶⁴¹⁸ is an apocalyptic number.

646418 is a deficient number, since it is larger than the sum of its proper divisors (374302).

646418 is a wasteful number, since it uses less digits than its factorization.

646418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17032.

The product of its digits is 4608, while the sum is 29.

The square root of 646418 is about 804.0012437801. The cubic root of 646418 is about 86.4644958818.

The spelling of 646418 in words is "six hundred forty-six thousand, four hundred eighteen".