641894 has 16 divisors (see below), whose sum is σ = 1062720. Its totient is φ = 288360.

The previous prime is 641891. The next prime is 641897. The reversal of 641894 is 498146.

It is an interprime number because it is at equal distance from previous prime (641891) and next prime (641897).

It is a self number, because there is not a number n which added to its sum of digits gives 641894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641891) 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, 3497 + ... + 3675.

It is an arithmetic number, because the mean of its divisors is an integer number (66420).

2⁶⁴¹⁸⁹⁴ is an apocalyptic number.

641894 is a deficient number, since it is larger than the sum of its proper divisors (420826).

641894 is a wasteful number, since it uses less digits than its factorization.

641894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355.

The product of its digits is 6912, while the sum is 32.

The square root of 641894 is about 801.1828755035. The cubic root of 641894 is about 86.2623142818.

The spelling of 641894 in words is "six hundred forty-one thousand, eight hundred ninety-four".