640041 has 8 divisors (see below), whose sum is σ = 858624. Its totient is φ = 424080.

The previous prime is 640039. The next prime is 640043. The reversal of 640041 is 140046.

It is an interprime number because it is at equal distance from previous prime (640039) and next prime (640043).

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

It is not a de Polignac number, because 640041 - 2¹ = 640039 is a prime.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 640041.

It is not an unprimeable number, because it can be changed into a prime (640043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15 + ... + 1131.

It is an arithmetic number, because the mean of its divisors is an integer number (107328).

2⁶⁴⁰⁰⁴¹ is an apocalyptic number.

It is an amenable number.

640041 is a deficient number, since it is larger than the sum of its proper divisors (218583).

640041 is a wasteful number, since it uses less digits than its factorization.

640041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 640041 is about 800.0256245896. The cubic root of 640041 is about 86.1792278083.

Adding to 640041 its reverse (140046), we get a palindrome (780087).

It can be divided in two parts, 6400 and 41, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 640041 in words is "six hundred forty thousand, forty-one".