231210540 has 144 divisors (see below), whose sum is σ = 810220320. Its totient is φ = 52746240.

The previous prime is 231210479. The next prime is 231210547. The reversal of 231210540 is 45012132.

231210540 is a `hidden beast` number, since 2 + 3 + 121 + 0 + 540 = 666.

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 (231210547) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30226 + ... + 37094.

It is an arithmetic number, because the mean of its divisors is an integer number (5626530).

Almost surely, 2^231210540 is an apocalyptic number.

231210540 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 231210540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405110160).

231210540 is an abundant number, since it is smaller than the sum of its proper divisors (579009780).

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

231210540 is a wasteful number, since it uses less digits than its factorization.

231210540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6912 (or 6907 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 231210540 is about 15205.6088335851. The cubic root of 231210540 is about 613.7655985793.

Adding to 231210540 its reverse (45012132), we get a palindrome (276222672).

The spelling of 231210540 in words is "two hundred thirty-one million, two hundred ten thousand, five hundred forty".