642603 has 8 divisors (see below), whose sum is σ = 922768. Its totient is φ = 395424.

The previous prime is 642581. The next prime is 642613. The reversal of 642603 is 306246.

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

It is not a de Polignac number, because 642603 - 2¹⁰ = 641579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642603.

It is not an unprimeable number, because it can be changed into a prime (642613) 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, 8200 + ... + 8277.

It is an arithmetic number, because the mean of its divisors is an integer number (115346).

2⁶⁴²⁶⁰³ is an apocalyptic number.

642603 is a deficient number, since it is larger than the sum of its proper divisors (280165).

642603 is a wasteful number, since it uses less digits than its factorization.

642603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16493.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 642603 is about 801.6252241540. The cubic root of 642603 is about 86.2940627619.

Adding to 642603 its reverse (306246), we get a palindrome (948849).

The spelling of 642603 in words is "six hundred forty-two thousand, six hundred three".