642834 has 24 divisors (see below), whose sum is σ = 1415232. Its totient is φ = 210840.

The previous prime is 642833. The next prime is 642853. The reversal of 642834 is 438246.

642834 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 642798 and 642807.

It is not an unprimeable number, because it can be changed into a prime (642833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1027 + ... + 1529.

It is an arithmetic number, because the mean of its divisors is an integer number (58968).

2⁶⁴²⁸³⁴ is an apocalyptic number.

642834 is an abundant number, since it is smaller than the sum of its proper divisors (772398).

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

642834 is a wasteful number, since it uses less digits than its factorization.

642834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 579 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 642834 is about 801.7692935003. The cubic root of 642834 is about 86.3044017220.

The spelling of 642834 in words is "six hundred forty-two thousand, eight hundred thirty-four".