43240889 has 2 divisors, whose sum is σ = 43240890. Its totient is φ = 43240888.

The previous prime is 43240871. The next prime is 43240891. The reversal of 43240889 is 98804234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42445225 + 795664 = 6515^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 43240889 - 2²⁰ = 42192313 is a prime.

Together with 43240891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43240849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21620444 + 21620445.

It is an arithmetic number, because the mean of its divisors is an integer number (21620445).

Almost surely, 2^43240889 is an apocalyptic number.

It is an amenable number.

43240889 is a deficient number, since it is larger than the sum of its proper divisors (1).

43240889 is an equidigital number, since it uses as much as digits as its factorization.

43240889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 43240889 is about 6575.7804859956. The cubic root of 43240889 is about 350.9927975297.

The spelling of 43240889 in words is "forty-three million, two hundred forty thousand, eight hundred eighty-nine".