643142 has 4 divisors (see below), whose sum is σ = 964716. Its totient is φ = 321570.

The previous prime is 643129. The next prime is 643183. The reversal of 643142 is 241346.

It is a happy number.

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

It is a nialpdrome in base 15.

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 643142.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160784 + ... + 160787.

It is an arithmetic number, because the mean of its divisors is an integer number (241179).

2⁶⁴³¹⁴² is an apocalyptic number.

643142 is a deficient number, since it is larger than the sum of its proper divisors (321574).

643142 is a wasteful number, since it uses less digits than its factorization.

643142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321573.

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

The square root of 643142 is about 801.9613457019. The cubic root of 643142 is about 86.3181831501.

Adding to 643142 its reverse (241346), we get a palindrome (884488).

It can be divided in two parts, 6 and 43142, that multiplied together give a palindrome (258852).

The spelling of 643142 in words is "six hundred forty-three thousand, one hundred forty-two".