231686 has 32 divisors (see below), whose sum is σ = 456960. Its totient is φ = 85536.

The previous prime is 231677. The next prime is 231701. The reversal of 231686 is 686132.

It is a Harshad number since it is a multiple of its sum of digits (26).

Its product of digits (1728) is a multiple of the sum of its prime divisors (108).

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3425 + ... + 3491.

It is an arithmetic number, because the mean of its divisors is an integer number (14280).

2²³¹⁶⁸⁶ is an apocalyptic number.

231686 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

231686 is a deficient number, since it is larger than the sum of its proper divisors (225274).

231686 is a wasteful number, since it uses less digits than its factorization.

231686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108.

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

The square root of 231686 is about 481.3377192783. The cubic root of 231686 is about 61.4186025184.

231686 divided by its sum of digits (26) gives a triangular number (8911 = T₁₃₃).

The spelling of 231686 in words is "two hundred thirty-one thousand, six hundred eighty-six".