43720559 has 2 divisors, whose sum is σ = 43720560. Its totient is φ = 43720558.

The previous prime is 43720553. The next prime is 43720561. The reversal of 43720559 is 95502734.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43720559 - 2⁴ = 43720543 is a prime.

It is a super-2 number, since 2×43720559² = 3822974558544962, which contains 22 as substring.

Together with 43720561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43720553) 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 as a sum of consecutive naturals, namely, 21860279 + 21860280.

It is an arithmetic number, because the mean of its divisors is an integer number (21860280).

Almost surely, 2^43720559 is an apocalyptic number.

43720559 is a deficient number, since it is larger than the sum of its proper divisors (1).

43720559 is an equidigital number, since it uses as much as digits as its factorization.

43720559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 43720559 is about 6612.1523727150. The cubic root of 43720559 is about 352.2858790491.

The spelling of 43720559 in words is "forty-three million, seven hundred twenty thousand, five hundred fifty-nine".