642503 has 4 divisors (see below), whose sum is σ = 650328. Its totient is φ = 634680.

The previous prime is 642487. The next prime is 642517. The reversal of 642503 is 305246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305246 = 2 ⋅152623.

It is a cyclic number.

It is not a de Polignac number, because 642503 - 2⁴ = 642487 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 642503.

It is not an unprimeable number, because it can be changed into a prime (642533) 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, 3788 + ... + 3953.

It is an arithmetic number, because the mean of its divisors is an integer number (162582).

2⁶⁴²⁵⁰³ is an apocalyptic number.

642503 is a deficient number, since it is larger than the sum of its proper divisors (7825).

642503 is an equidigital number, since it uses as much as digits as its factorization.

642503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7824.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 642503 is about 801.5628484405. The cubic root of 642503 is about 86.2895862531.

Adding to 642503 its reverse (305246), we get a palindrome (947749).

The spelling of 642503 in words is "six hundred forty-two thousand, five hundred three".