642142 has 12 divisors (see below), whose sum is σ = 992448. Its totient is φ = 311600.

The previous prime is 642133. The next prime is 642149. The reversal of 642142 is 241246.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3267 + ... + 3457.

It is an arithmetic number, because the mean of its divisors is an integer number (82704).

2⁶⁴²¹⁴² is an apocalyptic number.

642142 is a deficient number, since it is larger than the sum of its proper divisors (350306).

642142 is a wasteful number, since it uses less digits than its factorization.

642142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 234 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 642142 is about 801.3376317134. The cubic root of 642142 is about 86.2734221903.

Adding to 642142 its reverse (241246), we get a palindrome (883388).

It can be divided in two parts, 642 and 142, that added together give a square (784 = 28²).

The spelling of 642142 in words is "six hundred forty-two thousand, one hundred forty-two".