231404442 has 16 divisors (see below), whose sum is σ = 490033152. Its totient is φ = 72597440.

The previous prime is 231404441. The next prime is 231404443. The reversal of 231404442 is 244404132.

It is a happy number.

231404442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231404441) and next prime (231404443).

It is not an unprimeable number, because it can be changed into a prime (231404441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1134234 + ... + 1134437.

It is an arithmetic number, because the mean of its divisors is an integer number (30627072).

Almost surely, 2^231404442 is an apocalyptic number.

231404442 is an abundant number, since it is smaller than the sum of its proper divisors (258628710).

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

231404442 is a wasteful number, since it uses less digits than its factorization.

231404442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268693.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 231404442 is about 15211.9834998596. The cubic root of 231404442 is about 613.9371264051.

Adding to 231404442 its reverse (244404132), we get a palindrome (475808574).

The spelling of 231404442 in words is "two hundred thirty-one million, four hundred four thousand, four hundred forty-two".