231400240 has 80 divisors (see below), whose sum is σ = 591033600. Its totient is φ = 83863296.

The previous prime is 231400237. The next prime is 231400241. The reversal of 231400240 is 42004132.

231400240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is not an unprimeable number, because it can be changed into a prime (231400241) 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, 31651 + ... + 38269.

It is an arithmetic number, because the mean of its divisors is an integer number (7387920).

Almost surely, 2^231400240 is an apocalyptic number.

231400240 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 231400240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295516800).

231400240 is an abundant number, since it is smaller than the sum of its proper divisors (359633360).

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

231400240 is a wasteful number, since it uses less digits than its factorization.

231400240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6674 (or 6668 counting only the distinct ones).

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

The square root of 231400240 is about 15211.8453844364. The cubic root of 231400240 is about 613.9334102860.

Adding to 231400240 its reverse (42004132), we get a palindrome (273404372).

The spelling of 231400240 in words is "two hundred thirty-one million, four hundred thousand, two hundred forty".