642234 has 16 divisors (see below), whose sum is σ = 1329120. Its totient is φ = 206640.

The previous prime is 642233. The next prime is 642241. The reversal of 642234 is 432246.

It is a self number, because there is not a number n which added to its sum of digits gives 642234.

It is not an unprimeable number, because it can be changed into a prime (642233) 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 7 ways as a sum of consecutive naturals, for example, 1672 + ... + 2019.

It is an arithmetic number, because the mean of its divisors is an integer number (83070).

2⁶⁴²²³⁴ is an apocalyptic number.

642234 is an abundant number, since it is smaller than the sum of its proper divisors (686886).

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

642234 is a wasteful number, since it uses less digits than its factorization.

642234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725.

The product of its digits is 1152, while the sum is 21.

The square root of 642234 is about 801.3950336757. The cubic root of 642234 is about 86.2775421387.

The spelling of 642234 in words is "six hundred forty-two thousand, two hundred thirty-four".