642835 has 8 divisors (see below), whose sum is σ = 781200. Its totient is φ = 507744.

The previous prime is 642833. The next prime is 642853. The reversal of 642835 is 538246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642835 - 2¹ = 642833 is a prime.

642835 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (642833) 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, 360 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (97650).

2⁶⁴²⁸³⁵ is an apocalyptic number.

642835 is a deficient number, since it is larger than the sum of its proper divisors (138365).

642835 is a wasteful number, since it uses less digits than its factorization.

642835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637.

The product of its digits is 5760, while the sum is 28.

The square root of 642835 is about 801.7699171209. The cubic root of 642835 is about 86.3044464741.

The spelling of 642835 in words is "six hundred forty-two thousand, eight hundred thirty-five".