231386 has 4 divisors (see below), whose sum is σ = 347082. Its totient is φ = 115692.

The previous prime is 231379. The next prime is 231409. The reversal of 231386 is 683132.

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

It can be written as a sum of positive squares in only one way, i.e., 231361 + 25 = 481^2 + 5^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57845 + ... + 57848.

2²³¹³⁸⁶ is an apocalyptic number.

231386 is a deficient number, since it is larger than the sum of its proper divisors (115696).

231386 is a wasteful number, since it uses less digits than its factorization.

231386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115695.

The product of its digits is 864, while the sum is 23.

The square root of 231386 is about 481.0259868240. The cubic root of 231386 is about 61.3920816535.

It can be divided in two parts, 23 and 1386, that multiplied together give a triangular number (31878 = T₂₅₂).

The spelling of 231386 in words is "two hundred thirty-one thousand, three hundred eighty-six".