231223540 has 24 divisors (see below), whose sum is σ = 511126560. Its totient is φ = 87621408.

The previous prime is 231223507. The next prime is 231223541. The reversal of 231223540 is 45322132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231223541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303862 + ... + 304621.

It is an arithmetic number, because the mean of its divisors is an integer number (21296940).

Almost surely, 2^231223540 is an apocalyptic number.

231223540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231223540 is an abundant number, since it is smaller than the sum of its proper divisors (279903020).

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

231223540 is a wasteful number, since it uses less digits than its factorization.

231223540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608511 (or 608509 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 231223540 is about 15206.0363014166. The cubic root of 231223540 is about 613.7771015198. Note that the first 3 decimals are identical.

Adding to 231223540 its reverse (45322132), we get a palindrome (276545672).

It can be divided in two parts, 23122 and 3540, that added together give a palindrome (26662).

The spelling of 231223540 in words is "two hundred thirty-one million, two hundred twenty-three thousand, five hundred forty".