43740989 has 2 divisors, whose sum is σ = 43740990. Its totient is φ = 43740988.

The previous prime is 43740971. The next prime is 43740997. The reversal of 43740989 is 98904734.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42680089 + 1060900 = 6533^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 43740989 - 2¹² = 43736893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43740689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21870494 + 21870495.

It is an arithmetic number, because the mean of its divisors is an integer number (21870495).

Almost surely, 2^43740989 is an apocalyptic number.

It is an amenable number.

43740989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43740989 is an equidigital number, since it uses as much as digits as its factorization.

43740989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 43740989 is about 6613.6970750103. The cubic root of 43740989 is about 352.3407432435.

The spelling of 43740989 in words is "forty-three million, seven hundred forty thousand, nine hundred eighty-nine".