231440424 has 16 divisors (see below), whose sum is σ = 578601120. Its totient is φ = 77146800.

The previous prime is 231440413. The next prime is 231440497. The reversal of 231440424 is 424044132.

It is a happy number.

It is a super-2 number, since 2×231440424² = 107129339722599552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 9643351 = 231440424 / (2 + 3 + 1 + 4 + 4 + 0 + 4 + 2 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 231440394 and 231440403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4821652 + ... + 4821699.

It is an arithmetic number, because the mean of its divisors is an integer number (36162570).

Almost surely, 2^231440424 is an apocalyptic number.

231440424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231440424 is an abundant number, since it is smaller than the sum of its proper divisors (347160696).

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

231440424 is a wasteful number, since it uses less digits than its factorization.

231440424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9643360 (or 9643356 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 231440424 is about 15213.1661398934. The cubic root of 231440424 is about 613.9689459337.

Adding to 231440424 its reverse (424044132), we get a palindrome (655484556).

The spelling of 231440424 in words is "two hundred thirty-one million, four hundred forty thousand, four hundred twenty-four".