231209984 has 44 divisors (see below), whose sum is σ = 482338704. Its totient is φ = 110567424.

The previous prime is 231209983. The next prime is 231210017. The reversal of 231209984 is 489902132.

231209984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231209983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18644 + ... + 28460.

Almost surely, 2^231209984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231209984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241169352).

231209984 is an abundant number, since it is smaller than the sum of its proper divisors (251128720).

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

231209984 is an equidigital number, since it uses as much as digits as its factorization.

231209984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9860 (or 9842 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 231209984 is about 15205.5905508468. The cubic root of 231209984 is about 613.7651065977.

The spelling of 231209984 in words is "two hundred thirty-one million, two hundred nine thousand, nine hundred eighty-four".