642837 has 16 divisors (see below), whose sum is σ = 943488. Its totient is φ = 386880.

The previous prime is 642833. The next prime is 642853. The reversal of 642837 is 738246.

It is not a de Polignac number, because 642837 - 2² = 642833 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 1912 + ... + 2222.

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

2⁶⁴²⁸³⁷ is an apocalyptic number.

It is an amenable number.

642837 is a deficient number, since it is larger than the sum of its proper divisors (300651).

642837 is a wasteful number, since it uses less digits than its factorization.

642837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380.

The product of its digits is 8064, while the sum is 30.

The square root of 642837 is about 801.7711643605. The cubic root of 642837 is about 86.3045359780.

The spelling of 642837 in words is "six hundred forty-two thousand, eight hundred thirty-seven".