640413 has 8 divisors (see below), whose sum is σ = 948800. Its totient is φ = 426924.

The previous prime is 640411. The next prime is 640421. The reversal of 640413 is 314046.

It is not a de Polignac number, because 640413 - 2¹ = 640411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640411) by changing a digit.

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, 11833 + ... + 11886.

It is an arithmetic number, because the mean of its divisors is an integer number (118600).

2⁶⁴⁰⁴¹³ is an apocalyptic number.

It is an amenable number.

640413 is a deficient number, since it is larger than the sum of its proper divisors (308387).

640413 is a wasteful number, since it uses less digits than its factorization.

640413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23728 (or 23722 counting only the distinct ones).

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

The square root of 640413 is about 800.2580833706. The cubic root of 640413 is about 86.1959207304.

Adding to 640413 its reverse (314046), we get a palindrome (954459).

The spelling of 640413 in words is "six hundred forty thousand, four hundred thirteen".