231424140 has 48 divisors (see below), whose sum is σ = 651990528. Its totient is φ = 61331904.

The previous prime is 231424139. The next prime is 231424153. The reversal of 231424140 is 41424132.

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, 2052 + ... + 21611.

It is an arithmetic number, because the mean of its divisors is an integer number (13583136).

Almost surely, 2^231424140 is an apocalyptic number.

231424140 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 231424140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325995264).

231424140 is an abundant number, since it is smaller than the sum of its proper divisors (420566388).

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

231424140 is a wasteful number, since it uses less digits than its factorization.

231424140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23838 (or 23836 counting only the distinct ones).

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

The square root of 231424140 is about 15212.6309361662. The cubic root of 231424140 is about 613.9545461087.

Adding to 231424140 its reverse (41424132), we get a palindrome (272848272).

The spelling of 231424140 in words is "two hundred thirty-one million, four hundred twenty-four thousand, one hundred forty".