43400089 has 2 divisors, whose sum is σ = 43400090. Its totient is φ = 43400088.

The previous prime is 43400087. The next prime is 43400101. The reversal of 43400089 is 98000434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42575625 + 824464 = 6525^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 43400089 - 2¹ = 43400087 is a prime.

Together with 43400087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43400087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21700044 + 21700045.

It is an arithmetic number, because the mean of its divisors is an integer number (21700045).

Almost surely, 2^43400089 is an apocalyptic number.

It is an amenable number.

43400089 is a deficient number, since it is larger than the sum of its proper divisors (1).

43400089 is an equidigital number, since it uses as much as digits as its factorization.

43400089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 43400089 is about 6587.8743916380. The cubic root of 43400089 is about 351.4230200896.

The spelling of 43400089 in words is "forty-three million, four hundred thousand, eighty-nine".