231642 has 24 divisors (see below), whose sum is σ = 532116. Its totient is φ = 72576.

The previous prime is 231631. The next prime is 231643. The reversal of 231642 is 246132.

It is a happy number.

231642 is a `hidden beast` number, since 23 + 1 + 642 = 666.

231642 is digitally balanced in base 2, 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 2 ways, for example, as 221841 + 9801 = 471^2 + 99^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73 + ... + 684.

2²³¹⁶⁴² is an apocalyptic number.

231642 is an abundant number, since it is smaller than the sum of its proper divisors (300474).

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

231642 is a wasteful number, since it uses less digits than its factorization.

231642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782 (or 779 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 231642 is about 481.2920111533. The cubic root of 231642 is about 61.4147142247.

Adding to 231642 its reverse (246132), we get a palindrome (477774).

The spelling of 231642 in words is "two hundred thirty-one thousand, six hundred forty-two".