231989120 has 128 divisors (see below), whose sum is σ = 625121280. Its totient is φ = 81561600.

The previous prime is 231989117. The next prime is 231989143. The reversal of 231989120 is 21989132.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217709 + ... + 218771.

It is an arithmetic number, because the mean of its divisors is an integer number (4883760).

Almost surely, 2^231989120 is an apocalyptic number.

231989120 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 231989120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312560640).

231989120 is an abundant number, since it is smaller than the sum of its proper divisors (393132160).

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

231989120 is a wasteful number, since it uses less digits than its factorization.

231989120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 231989120 is about 15231.1890540430. The cubic root of 231989120 is about 614.4537595827.

The spelling of 231989120 in words is "two hundred thirty-one million, nine hundred eighty-nine thousand, one hundred twenty".