43720270987 has 2 divisors, whose sum is σ = 43720270988. Its totient is φ = 43720270986.

The previous prime is 43720270949. The next prime is 43720271009. The reversal of 43720270987 is 78907202734.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43720270987 - 2¹¹ = 43720268939 is a prime.

It is a super-2 number, since 2×43720270987² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43720270987.

It is not a weakly prime, because it can be changed into another prime (43720277987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21860135493 + 21860135494.

It is an arithmetic number, because the mean of its divisors is an integer number (21860135494).

Almost surely, 2^43720270987 is an apocalyptic number.

43720270987 is a deficient number, since it is larger than the sum of its proper divisors (1).

43720270987 is an equidigital number, since it uses as much as digits as its factorization.

43720270987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 43720270987 in words is "forty-three billion, seven hundred twenty million, two hundred seventy thousand, nine hundred eighty-seven".