641982 has 32 divisors (see below), whose sum is σ = 1430784. Its totient is φ = 190400.

The previous prime is 641981. The next prime is 642011. The reversal of 641982 is 289146.

641982 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4618 + ... + 4754.

It is an arithmetic number, because the mean of its divisors is an integer number (44712).

2⁶⁴¹⁹⁸² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (715392).

641982 is an abundant number, since it is smaller than the sum of its proper divisors (788802).

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

641982 is a wasteful number, since it uses less digits than its factorization.

641982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224.

The product of its digits is 3456, while the sum is 30.

The square root of 641982 is about 801.2377924187. The cubic root of 641982 is about 86.2662561252.

Subtracting from 641982 its reverse (289146), we obtain a square (352836 = 594²).

The spelling of 641982 in words is "six hundred forty-one thousand, nine hundred eighty-two".