231388 has 6 divisors (see below), whose sum is σ = 404936. Its totient is φ = 115692.

The previous prime is 231379. The next prime is 231409. The reversal of 231388 is 883132.

It is a congruent number.

It is an unprimeable number.

231388 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 28920 + ... + 28927.

2²³¹³⁸⁸ is an apocalyptic number.

It is an amenable number.

231388 is a deficient number, since it is larger than the sum of its proper divisors (173548).

231388 is a wasteful number, since it uses less digits than its factorization.

231388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57851 (or 57849 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 231388 is about 481.0280657093. The cubic root of 231388 is about 61.3922585351.

It can be divided in two parts, 2313 and 88, that added together give a 4-th power (2401 = 7⁴).

The spelling of 231388 in words is "two hundred thirty-one thousand, three hundred eighty-eight".