642935 has 8 divisors (see below), whose sum is σ = 777600. Its totient is φ = 510304.

The previous prime is 642931. The next prime is 642937. The reversal of 642935 is 539246.

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 642935 - 2² = 642931 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 642898 and 642907.

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 642935.

It is not an unprimeable number, because it can be changed into a prime (642931) 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, 314 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2⁶⁴²⁹³⁵ is an apocalyptic number.

642935 is a deficient number, since it is larger than the sum of its proper divisors (134665).

642935 is a wasteful number, since it uses less digits than its factorization.

642935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017.

The product of its digits is 6480, while the sum is 29.

The square root of 642935 is about 801.8322767262. The cubic root of 642935 is about 86.3089214415.

The spelling of 642935 in words is "six hundred forty-two thousand, nine hundred thirty-five".