123687 has 12 divisors (see below), whose sum is σ = 185640. Its totient is φ = 82296.

The previous prime is 123677. The next prime is 123701. The reversal of 123687 is 786321.

It is not a de Polignac number, because 123687 - 2¹⁰ = 122663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 123687.

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 123687.

It is not an unprimeable number, because it can be changed into a prime (123637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12 + ... + 497.

It is an arithmetic number, because the mean of its divisors is an integer number (15470).

2¹²³⁶⁸⁷ is an apocalyptic number.

123687 is a deficient number, since it is larger than the sum of its proper divisors (61953).

123687 is an frugal number, since it uses more digits than its factorization.

123687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 512 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 123687 is about 351.6916262864. The cubic root of 123687 is about 49.8243167643.

It can be divided in two parts, 12 and 3687, that multiplied together give a palindrome (44244).

The spelling of 123687 in words is "one hundred twenty-three thousand, six hundred eighty-seven".