641586 has 16 divisors (see below), whose sum is σ = 1399968. Its totient is φ = 194400.

The previous prime is 641581. The next prime is 641623. The reversal of 641586 is 685146.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641581) by changing a digit.

641586 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4795 + ... + 4926.

It is an arithmetic number, because the mean of its divisors is an integer number (87498).

2⁶⁴¹⁵⁸⁶ is an apocalyptic number.

641586 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

641586 is an abundant number, since it is smaller than the sum of its proper divisors (758382).

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

641586 is a wasteful number, since it uses less digits than its factorization.

641586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9737.

The product of its digits is 5760, while the sum is 30.

The square root of 641586 is about 800.9906366494. The cubic root of 641586 is about 86.2485149923.

The spelling of 641586 in words is "six hundred forty-one thousand, five hundred eighty-six".