43442431 has 4 divisors (see below), whose sum is σ = 44154664. Its totient is φ = 42730200.

The previous prime is 43442393. The next prime is 43442453. The reversal of 43442431 is 13424434.

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 43442431 - 2¹³ = 43434239 is a prime.

It is a super-2 number, since 2×43442431² = 3774489622379522, 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 = 43442396 and 43442405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43442461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356025 + ... + 356146.

It is an arithmetic number, because the mean of its divisors is an integer number (11038666).

Almost surely, 2^43442431 is an apocalyptic number.

43442431 is a deficient number, since it is larger than the sum of its proper divisors (712233).

43442431 is an equidigital number, since it uses as much as digits as its factorization.

43442431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712232.

The product of its digits is 4608, while the sum is 25.

The square root of 43442431 is about 6591.0872395986. The cubic root of 43442431 is about 351.5372680663.

Adding to 43442431 its reverse (13424434), we get a palindrome (56866865).

The spelling of 43442431 in words is "forty-three million, four hundred forty-two thousand, four hundred thirty-one".