231387 has 16 divisors (see below), whose sum is σ = 352800. Its totient is φ = 133632.

The previous prime is 231379. The next prime is 231409. The reversal of 231387 is 783132.

It is not a de Polignac number, because 231387 - 2³ = 231379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489 + ... + 837.

It is an arithmetic number, because the mean of its divisors is an integer number (22050).

2²³¹³⁸⁷ is an apocalyptic number.

231387 is a deficient number, since it is larger than the sum of its proper divisors (121413).

231387 is a wasteful number, since it uses less digits than its factorization.

231387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382.

The product of its digits is 1008, while the sum is 24.

The square root of 231387 is about 481.0270262678. The cubic root of 231387 is about 61.3921700944.

The spelling of 231387 in words is "two hundred thirty-one thousand, three hundred eighty-seven".