43720823 has 2 divisors, whose sum is σ = 43720824. Its totient is φ = 43720822.

The previous prime is 43720793. The next prime is 43720837. The reversal of 43720823 is 32802734.

43720823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43720823 - 2⁶ = 43720759 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43720123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21860411 + 21860412.

It is an arithmetic number, because the mean of its divisors is an integer number (21860412).

Almost surely, 2^43720823 is an apocalyptic number.

43720823 is a deficient number, since it is larger than the sum of its proper divisors (1).

43720823 is an equidigital number, since it uses as much as digits as its factorization.

43720823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 43720823 is about 6612.1723359271. The cubic root of 43720823 is about 352.2865881227.

The spelling of 43720823 in words is "forty-three million, seven hundred twenty thousand, eight hundred twenty-three".