43440043 has 4 divisors (see below), whose sum is σ = 43543648. Its totient is φ = 43336440.

The previous prime is 43440029. The next prime is 43440073. The reversal of 43440043 is 34004434.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34004434 = 2 ⋅17002217.

It is a cyclic number.

It is not a de Polignac number, because 43440043 - 2⁵ = 43440011 is a prime.

It is a super-4 number, since 4×43440043⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43439996 and 43440023.

It is not an unprimeable number, because it can be changed into a prime (43440013) 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, 51171 + ... + 52012.

It is an arithmetic number, because the mean of its divisors is an integer number (10885912).

Almost surely, 2^43440043 is an apocalyptic number.

43440043 is a deficient number, since it is larger than the sum of its proper divisors (103605).

43440043 is a wasteful number, since it uses less digits than its factorization.

43440043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103604.

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 43440043 is about 6590.9060833849. The cubic root of 43440043 is about 351.5308266958.

Adding to 43440043 its reverse (34004434), we get a palindrome (77444477).

The spelling of 43440043 in words is "forty-three million, four hundred forty thousand, forty-three".