642812 has 12 divisors (see below), whose sum is σ = 1130976. Its totient is φ = 319680.

The previous prime is 642809. The next prime is 642833. The reversal of 642812 is 218246.

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 642812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788 + ... + 1380.

It is an arithmetic number, because the mean of its divisors is an integer number (94248).

2⁶⁴²⁸¹² is an apocalyptic number.

It is an amenable number.

642812 is a deficient number, since it is larger than the sum of its proper divisors (488164).

642812 is a wasteful number, since it uses less digits than its factorization.

642812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 866 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 642812 is about 801.7555737256. The cubic root of 642812 is about 86.3034171659.

The spelling of 642812 in words is "six hundred forty-two thousand, eight hundred twelve".