642703 has 4 divisors (see below), whose sum is σ = 644328. Its totient is φ = 641080.

The previous prime is 642701. The next prime is 642737. The reversal of 642703 is 307246.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 307246 = 2 ⋅153623.

It is a cyclic number.

It is not a de Polignac number, because 642703 - 2¹ = 642701 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 (642701) 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, 213 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (161082).

2⁶⁴²⁷⁰³ is an apocalyptic number.

642703 is a deficient number, since it is larger than the sum of its proper divisors (1625).

642703 is an equidigital number, since it uses as much as digits as its factorization.

642703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 642703 is about 801.6875950144. The cubic root of 642703 is about 86.2985388063.

Adding to 642703 its reverse (307246), we get a palindrome (949949).

The spelling of 642703 in words is "six hundred forty-two thousand, seven hundred three".