43540069 has 2 divisors, whose sum is σ = 43540070. Its totient is φ = 43540068.

The previous prime is 43540033. The next prime is 43540087. The reversal of 43540069 is 96004534.

43540069 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 can be written as a sum of positive squares in only one way, i.e., 30305025 + 13235044 = 5505^2 + 3638^2 .

It is a cyclic number.

It is not a de Polignac number, because 43540069 - 2¹¹ = 43538021 is a prime.

It is a super-2 number, since 2×43540069² = 3791475217049522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43540069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43540969) 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, 21770034 + 21770035.

It is an arithmetic number, because the mean of its divisors is an integer number (21770035).

Almost surely, 2^43540069 is an apocalyptic number.

It is an amenable number.

43540069 is a deficient number, since it is larger than the sum of its proper divisors (1).

43540069 is an equidigital number, since it uses as much as digits as its factorization.

43540069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 43540069 is about 6598.4899030005. The cubic root of 43540069 is about 351.8004340756.

It can be divided in two parts, 435 and 40069, that added together give a palindrome (40504).

The spelling of 43540069 in words is "forty-three million, five hundred forty thousand, sixty-nine".