231089840 has 40 divisors (see below), whose sum is σ = 568892160. Its totient is φ = 86998016.

The previous prime is 231089821. The next prime is 231089849. The reversal of 231089840 is 48980132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 231089840.

It is not an unprimeable number, because it can be changed into a prime (231089849) 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, 83600 + ... + 86319.

It is an arithmetic number, because the mean of its divisors is an integer number (14222304).

Almost surely, 2^231089840 is an apocalyptic number.

231089840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231089840 is an abundant number, since it is smaller than the sum of its proper divisors (337802320).

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

231089840 is a wasteful number, since it uses less digits than its factorization.

231089840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169949 (or 169943 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 231089840 is about 15201.6393852768. The cubic root of 231089840 is about 613.6587776092.

The spelling of 231089840 in words is "two hundred thirty-one million, eighty-nine thousand, eight hundred forty".