642143 has 4 divisors (see below), whose sum is σ = 675960. Its totient is φ = 608328.

The previous prime is 642133. The next prime is 642149. The reversal of 642143 is 341246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642143 - 2⁶ = 642079 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 (642149) 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, 16880 + ... + 16917.

It is an arithmetic number, because the mean of its divisors is an integer number (168990).

2⁶⁴²¹⁴³ is an apocalyptic number.

642143 is a deficient number, since it is larger than the sum of its proper divisors (33817).

642143 is a wasteful number, since it uses less digits than its factorization.

642143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33816.

The product of its digits is 576, while the sum is 20.

The square root of 642143 is about 801.3382556699. The cubic root of 642143 is about 86.2734669744.

Adding to 642143 its reverse (341246), we get a palindrome (983389).

It can be divided in two parts, 642 and 143, that multiplied together give a triangular number (91806 = T₄₂₈).

The spelling of 642143 in words is "six hundred forty-two thousand, one hundred forty-three".