231720384 has 56 divisors (see below), whose sum is σ = 700682368. Its totient is φ = 66205440.

The previous prime is 231720341. The next prime is 231720389. The reversal of 231720384 is 483027132.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×231720384² = 107388672722214912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231720389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84862 + ... + 87549.

Almost surely, 2^231720384 is an apocalyptic number.

231720384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231720384 is an abundant number, since it is smaller than the sum of its proper divisors (468961984).

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

231720384 is a wasteful number, since it uses less digits than its factorization.

231720384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172433 (or 172423 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 231720384 is about 15222.3645994964. The cubic root of 231720384 is about 614.2164070046.

The spelling of 231720384 in words is "two hundred thirty-one million, seven hundred twenty thousand, three hundred eighty-four".