231420144 has 80 divisors (see below), whose sum is σ = 611353728. Its totient is φ = 75415296.

The previous prime is 231420139. The next prime is 231420173. The reversal of 231420144 is 441024132.

231420144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 231420144.

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, 729874 + ... + 730190.

Almost surely, 2^231420144 is an apocalyptic number.

231420144 is a gapful number since it is divisible by the number (24) 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 231420144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305676864).

231420144 is an abundant number, since it is smaller than the sum of its proper divisors (379933584).

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

231420144 is a wasteful number, since it uses less digits than its factorization.

231420144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 231420144 is about 15212.4995973706. The cubic root of 231420144 is about 613.9510123712.

Adding to 231420144 its reverse (441024132), we get a palindrome (672444276).

The spelling of 231420144 in words is "two hundred thirty-one million, four hundred twenty thousand, one hundred forty-four".