231001440 has 96 divisors (see below), whose sum is σ = 770484960. Its totient is φ = 57974784.

The previous prime is 231001403. The next prime is 231001483. The reversal of 231001440 is 44100132.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5995 + ... + 22314.

It is an arithmetic number, because the mean of its divisors is an integer number (8025885).

Almost surely, 2^231001440 is an apocalyptic number.

231001440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231001440 is an abundant number, since it is smaller than the sum of its proper divisors (539483520).

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

231001440 is a wasteful number, since it uses less digits than its factorization.

231001440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28344 (or 28336 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 231001440 is about 15198.7315260189. The cubic root of 231001440 is about 613.5805189334.

Adding to 231001440 its reverse (44100132), we get a palindrome (275101572).

The spelling of 231001440 in words is "two hundred thirty-one million, one thousand, four hundred forty".