641742 has 8 divisors (see below), whose sum is σ = 1283496. Its totient is φ = 213912.

The previous prime is 641713. The next prime is 641747. The reversal of 641742 is 247146.

It is a sphenic number, since it is the product of 3 distinct primes.

641742 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641747) by changing a digit.

641742 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 3 ways as a sum of consecutive naturals, for example, 53473 + ... + 53484.

It is an arithmetic number, because the mean of its divisors is an integer number (160437).

2⁶⁴¹⁷⁴² is an apocalyptic number.

641742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

641742 is a wasteful number, since it uses less digits than its factorization.

641742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106962.

The product of its digits is 1344, while the sum is 24.

The square root of 641742 is about 801.0880101462. The cubic root of 641742 is about 86.2555047946.

Adding to 641742 its reverse (247146), we get a palindrome (888888).

The spelling of 641742 in words is "six hundred forty-one thousand, seven hundred forty-two".