641838 has 16 divisors (see below), whose sum is σ = 1339776. Its totient is φ = 204600.

The previous prime is 641833. The next prime is 641843. The reversal of 641838 is 838146.

It is a happy number.

641838 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (641833) and next prime (641843).

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641838.

It is not an unprimeable number, because it can be changed into a prime (641833) by changing a digit.

641838 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 2188 + ... + 2463.

It is an arithmetic number, because the mean of its divisors is an integer number (83736).

2⁶⁴¹⁸³⁸ is an apocalyptic number.

641838 is an abundant number, since it is smaller than the sum of its proper divisors (697938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641838 is a wasteful number, since it uses less digits than its factorization.

641838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679.

The product of its digits is 4608, while the sum is 30.

The square root of 641838 is about 801.1479264156. The cubic root of 641838 is about 86.2598056485.

The spelling of 641838 in words is "six hundred forty-one thousand, eight hundred thirty-eight".