640341 has 18 divisors (see below), whose sum is σ = 1003938. Its totient is φ = 393120.

The previous prime is 640333. The next prime is 640363. The reversal of 640341 is 143046.

640341 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 77841 + 562500 = 279^2 + 750^2 .

It is not a de Polignac number, because 640341 - 2³ = 640333 is a prime.

640341 is strictly pandigital in base 7.

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 640341.

It is not an unprimeable number, because it can be changed into a prime (640741) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1311 + ... + 1731.

2⁶⁴⁰³⁴¹ is an apocalyptic number.

It is an amenable number.

640341 is a deficient number, since it is larger than the sum of its proper divisors (363597).

640341 is a wasteful number, since it uses less digits than its factorization.

640341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 640341 is about 800.2130966186. The cubic root of 640341 is about 86.1926903469.

Adding to 640341 its reverse (143046), we get a palindrome (783387).

The spelling of 640341 in words is "six hundred forty thousand, three hundred forty-one".