87909 has 4 divisors (see below), whose sum is σ = 117216. Its totient is φ = 58604.

The previous prime is 87887. The next prime is 87911. The reversal of 87909 is 90978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87909 - 2⁵ = 87877 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 87909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87959) 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, 14649 + ... + 14654.

It is an arithmetic number, because the mean of its divisors is an integer number (29304).

2⁸⁷⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

87909 is a deficient number, since it is larger than the sum of its proper divisors (29307).

87909 is a wasteful number, since it uses less digits than its factorization.

87909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29306.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 87909 is about 296.4945193423. The cubic root of 87909 is about 44.4642645395.

The spelling of 87909 in words is "eighty-seven thousand, nine hundred nine".