231243820 has 24 divisors (see below), whose sum is σ = 489324528. Its totient is φ = 91790400.

The previous prime is 231243811. The next prime is 231243847. The reversal of 231243820 is 28342132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41511 + ... + 46750.

It is an arithmetic number, because the mean of its divisors is an integer number (20388522).

Almost surely, 2^231243820 is an apocalyptic number.

231243820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231243820 is an abundant number, since it is smaller than the sum of its proper divisors (258080708).

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

231243820 is a wasteful number, since it uses less digits than its factorization.

231243820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88401 (or 88399 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 231243820 is about 15206.7031272396. The cubic root of 231243820 is about 613.7950452460.

Adding to 231243820 its reverse (28342132), we get a palindrome (259585952).

The spelling of 231243820 in words is "two hundred thirty-one million, two hundred forty-three thousand, eight hundred twenty".