123686 has 4 divisors (see below), whose sum is σ = 185532. Its totient is φ = 61842.

The previous prime is 123677. The next prime is 123701. The reversal of 123686 is 686321.

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

It is an Ulam number.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

123686 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30920 + ... + 30923.

It is an arithmetic number, because the mean of its divisors is an integer number (46383).

2¹²³⁶⁸⁶ is an apocalyptic number.

123686 is a deficient number, since it is larger than the sum of its proper divisors (61846).

123686 is an equidigital number, since it uses as much as digits as its factorization.

123686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61845.

The product of its digits is 1728, while the sum is 26.

The square root of 123686 is about 351.6902045835. The cubic root of 123686 is about 49.8241824887.

The spelling of 123686 in words is "one hundred twenty-three thousand, six hundred eighty-six".