43520723 has 2 divisors, whose sum is σ = 43520724. Its totient is φ = 43520722.

The previous prime is 43520717. The next prime is 43520747. The reversal of 43520723 is 32702534.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43520723 - 2¹⁶ = 43455187 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 43520692 and 43520701.

It is not a weakly prime, because it can be changed into another prime (43520713) by changing a digit.

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 as a sum of consecutive naturals, namely, 21760361 + 21760362.

It is an arithmetic number, because the mean of its divisors is an integer number (21760362).

Almost surely, 2^43520723 is an apocalyptic number.

43520723 is a deficient number, since it is larger than the sum of its proper divisors (1).

43520723 is an equidigital number, since it uses as much as digits as its factorization.

43520723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 26.

The square root of 43520723 is about 6597.0237986535. The cubic root of 43520723 is about 351.7483216221.

The spelling of 43520723 in words is "forty-three million, five hundred twenty thousand, seven hundred twenty-three".