646195 has 16 divisors (see below), whose sum is σ = 875520. Its totient is φ = 453600.

The previous prime is 646193. The next prime is 646199. The reversal of 646195 is 591646.

It is not a de Polignac number, because 646195 - 2¹ = 646193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646193) 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 15 ways as a sum of consecutive naturals, for example, 1516 + ... + 1894.

It is an arithmetic number, because the mean of its divisors is an integer number (54720).

2⁶⁴⁶¹⁹⁵ is an apocalyptic number.

646195 is a deficient number, since it is larger than the sum of its proper divisors (229325).

646195 is a wasteful number, since it uses less digits than its factorization.

646195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426.

The product of its digits is 6480, while the sum is 31.

The square root of 646195 is about 803.8625504401. The cubic root of 646195 is about 86.4545519547.

It can be divided in two parts, 6461 and 95, that added together give a palindrome (6556).

The spelling of 646195 in words is "six hundred forty-six thousand, one hundred ninety-five".