43242431 has 4 divisors (see below), whose sum is σ = 43351752. Its totient is φ = 43133112.

The previous prime is 43242383. The next prime is 43242439. The reversal of 43242431 is 13424234.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43242431 - 2¹⁴ = 43226047 is a prime.

It is a super-2 number, since 2×43242431² = 3739815677579522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43242397 and 43242406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43242439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54065 + ... + 54858.

It is an arithmetic number, because the mean of its divisors is an integer number (10837938).

Almost surely, 2^43242431 is an apocalyptic number.

43242431 is a deficient number, since it is larger than the sum of its proper divisors (109321).

43242431 is a wasteful number, since it uses less digits than its factorization.

43242431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109320.

The product of its digits is 2304, while the sum is 23.

The square root of 43242431 is about 6575.8977333897. The cubic root of 43242431 is about 350.9969696954.

Adding to 43242431 its reverse (13424234), we get a palindrome (56666665).

The spelling of 43242431 in words is "forty-three million, two hundred forty-two thousand, four hundred thirty-one".