87123 has 8 divisors (see below), whose sum is σ = 117648. Its totient is φ = 57344.

The previous prime is 87121. The next prime is 87133. The reversal of 87123 is 32178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 13-Lehmer number, since φ(87123) divides (87123-1)¹³.

It is a cyclic number.

It is not a de Polignac number, because 87123 - 2¹ = 87121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87123.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 87123.

It is not an unprimeable number, because it can be changed into a prime (87121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211 + ... + 467.

It is an arithmetic number, because the mean of its divisors is an integer number (14706).

2⁸⁷¹²³ is an apocalyptic number.

87123 is a deficient number, since it is larger than the sum of its proper divisors (30525).

87123 is a wasteful number, since it uses less digits than its factorization.

87123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its digits is 336, while the sum is 21.

The square root of 87123 is about 295.1660549589. The cubic root of 87123 is about 44.3313483323.

Subtracting from 87123 its reverse (32178), we obtain a palindrome (54945).

It can be divided in two parts, 87 and 123, that multiplied together give a palindrome (10701).

The spelling of 87123 in words is "eighty-seven thousand, one hundred twenty-three".