231442340 has 48 divisors (see below), whose sum is σ = 500290560. Its totient is φ = 89886720.

The previous prime is 231442333. The next prime is 231442349. The reversal of 231442340 is 43244132.

It is not an unprimeable number, because it can be changed into a prime (231442349) 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, 163556 + ... + 164964.

It is an arithmetic number, because the mean of its divisors is an integer number (10422720).

Almost surely, 2^231442340 is an apocalyptic number.

231442340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231442340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250145280).

231442340 is an abundant number, since it is smaller than the sum of its proper divisors (268848220).

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

231442340 is a wasteful number, since it uses less digits than its factorization.

231442340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 1650 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 231442340 is about 15213.2291115332. The cubic root of 231442340 is about 613.9706401944.

Adding to 231442340 its reverse (43244132), we get a palindrome (274686472).

The spelling of 231442340 in words is "two hundred thirty-one million, four hundred forty-two thousand, three hundred forty".