640103 has 4 divisors (see below), whose sum is σ = 646800. Its totient is φ = 633408.

The previous prime is 640099. The next prime is 640109. The reversal of 640103 is 301046.

640103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301046 = 2 ⋅150523.

It is a cyclic number.

It is not a de Polignac number, because 640103 - 2² = 640099 is a prime.

It is a Duffinian number.

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 640103.

It is not an unprimeable number, because it can be changed into a prime (640109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3203 + ... + 3396.

It is an arithmetic number, because the mean of its divisors is an integer number (161700).

2⁶⁴⁰¹⁰³ is an apocalyptic number.

640103 is a deficient number, since it is larger than the sum of its proper divisors (6697).

640103 is an equidigital number, since it uses as much as digits as its factorization.

640103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 640103 is about 800.0643724101. The cubic root of 640103 is about 86.1820104111.

Adding to 640103 its reverse (301046), we get a palindrome (941149).

The spelling of 640103 in words is "six hundred forty thousand, one hundred three".