43019989 has 2 divisors, whose sum is σ = 43019990. Its totient is φ = 43019988.

The previous prime is 43019983. The next prime is 43020023. The reversal of 43019989 is 98991034.

43019989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 3392964 = 6295^2 + 1842^2 .

It is a cyclic number.

It is not a de Polignac number, because 43019989 - 2³ = 43019981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43019981) 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, 21509994 + 21509995.

It is an arithmetic number, because the mean of its divisors is an integer number (21509995).

Almost surely, 2^43019989 is an apocalyptic number.

It is an amenable number.

43019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43019989 is an equidigital number, since it uses as much as digits as its factorization.

43019989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 43019989 is about 6558.9624941754. The cubic root of 43019989 is about 350.3940840040.

The spelling of 43019989 in words is "forty-three million, nineteen thousand, nine hundred eighty-nine".