231424 has 24 divisors (see below), whose sum is σ = 466830. Its totient is φ = 114688.

The previous prime is 231419. The next prime is 231431. The reversal of 231424 is 424132.

231424 is nontrivially palindromic in base 15.

231424 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 230400 + 1024 = 480^2 + 32^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 231398 and 231407.

It is a congruent number.

It is an unprimeable number.

231424 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992 + ... + 2104.

2²³¹⁴²⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233415).

231424 is an abundant number, since it is smaller than the sum of its proper divisors (235406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231424 is an equidigital number, since it uses as much as digits as its factorization.

231424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 115 counting only the distinct ones).

The product of its digits is 192, while the sum is 16.

The square root of 231424 is about 481.0654841079. The cubic root of 231424 is about 61.3954422305.

Adding to 231424 its reverse (424132), we get a palindrome (655556).

The spelling of 231424 in words is "two hundred thirty-one thousand, four hundred twenty-four".