87839 has 4 divisors (see below), whose sum is σ = 93024. Its totient is φ = 82656.

The previous prime is 87833. The next prime is 87853. The reversal of 87839 is 93878.

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 87839 - 2⁸ = 87583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87799 and 87808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87833) 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 3 ways as a sum of consecutive naturals, for example, 2567 + ... + 2600.

It is an arithmetic number, because the mean of its divisors is an integer number (23256).

2⁸⁷⁸³⁹ is an apocalyptic number.

87839 is a deficient number, since it is larger than the sum of its proper divisors (5185).

87839 is a wasteful number, since it uses less digits than its factorization.

87839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5184.

The product of its digits is 12096, while the sum is 35.

The square root of 87839 is about 296.3764498067. The cubic root of 87839 is about 44.4524594341.

The spelling of 87839 in words is "eighty-seven thousand, eight hundred thirty-nine".