231405 has 8 divisors (see below), whose sum is σ = 370272. Its totient is φ = 123408.

The previous prime is 231379. The next prime is 231409. The reversal of 231405 is 504132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231405 - 2⁷ = 231277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 15427 = 231405 / (2 + 3 + 1 + 4 + 0 + 5).

231405 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231405.

It is not an unprimeable number, because it can be changed into a prime (231409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7699 + ... + 7728.

It is an arithmetic number, because the mean of its divisors is an integer number (46284).

2²³¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

231405 is a deficient number, since it is larger than the sum of its proper divisors (138867).

231405 is a wasteful number, since it uses less digits than its factorization.

231405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15435.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 231405 is about 481.0457358713. The cubic root of 231405 is about 61.3937619880.

Adding to 231405 its reverse (504132), we get a palindrome (735537).

It can be divided in two parts, 231 and 405, that added together give a palindrome (636).

The spelling of 231405 in words is "two hundred thirty-one thousand, four hundred five".