842687 has 4 divisors (see below), whose sum is σ = 848976. Its totient is φ = 836400.

The previous prime is 842657. The next prime is 842701. The reversal of 842687 is 786248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 842687 - 2⁶ = 842623 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

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 842687.

It is not an unprimeable number, because it can be changed into a prime (842617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2939 + ... + 3212.

It is an arithmetic number, because the mean of its divisors is an integer number (212244).

2⁸⁴²⁶⁸⁷ is an apocalyptic number.

842687 is a deficient number, since it is larger than the sum of its proper divisors (6289).

842687 is a wasteful number, since it uses less digits than its factorization.

842687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6288.

The product of its digits is 21504, while the sum is 35.

The square root of 842687 is about 917.9798472733. The cubic root of 842687 is about 94.4543792189.

The spelling of 842687 in words is "eight hundred forty-two thousand, six hundred eighty-seven".