646395 has 8 divisors (see below), whose sum is σ = 1034256. Its totient is φ = 344736.

The previous prime is 646379. The next prime is 646397. The reversal of 646395 is 593646.

It is a happy number.

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

It is not a de Polignac number, because 646395 - 2⁴ = 646379 is a prime.

646395 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (646397) 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, 21532 + ... + 21561.

It is an arithmetic number, because the mean of its divisors is an integer number (129282).

2⁶⁴⁶³⁹⁵ is an apocalyptic number.

646395 is a deficient number, since it is larger than the sum of its proper divisors (387861).

646395 is a wasteful number, since it uses less digits than its factorization.

646395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43101.

The product of its digits is 19440, while the sum is 33.

The square root of 646395 is about 803.9869401924. The cubic root of 646395 is about 86.4634703807.

The spelling of 646395 in words is "six hundred forty-six thousand, three hundred ninety-five".