642340 has 12 divisors (see below), whose sum is σ = 1348956. Its totient is φ = 256928.

The previous prime is 642281. The next prime is 642359. The reversal of 642340 is 43246.

It can be written as a sum of positive squares in 2 ways, for example, as 88804 + 553536 = 298^2 + 744^2 .

It is an unprimeable number.

642340 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16039 + ... + 16078.

It is an arithmetic number, because the mean of its divisors is an integer number (112413).

2⁶⁴²³⁴⁰ is an apocalyptic number.

It is an amenable number.

642340 is an abundant number, since it is smaller than the sum of its proper divisors (706616).

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

642340 is a wasteful number, since it uses less digits than its factorization.

642340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32126 (or 32124 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 642340 is about 801.4611656219. The cubic root of 642340 is about 86.2822885481.

Adding to 642340 its reverse (43246), we get a palindrome (685586).

The spelling of 642340 in words is "six hundred forty-two thousand, three hundred forty".