642140 has 24 divisors (see below), whose sum is σ = 1366512. Its totient is φ = 253440.

The previous prime is 642133. The next prime is 642149. The reversal of 642140 is 41246.

642140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 642140.

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 7 ways as a sum of consecutive naturals, for example, 1775 + ... + 2105.

It is an arithmetic number, because the mean of its divisors is an integer number (56938).

2⁶⁴²¹⁴⁰ is an apocalyptic number.

It is an amenable number.

642140 is an abundant number, since it is smaller than the sum of its proper divisors (724372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642140 is a wasteful number, since it uses less digits than its factorization.

642140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 642140 is about 801.3363837990. The cubic root of 642140 is about 86.2733326218.

Adding to 642140 its reverse (41246), we get a palindrome (683386).

The spelling of 642140 in words is "six hundred forty-two thousand, one hundred forty".