43973989 has 2 divisors, whose sum is σ = 43973990. Its totient is φ = 43973988.

The previous prime is 43973983. The next prime is 43974001. The reversal of 43973989 is 98937934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35224225 + 8749764 = 5935^2 + 2958^2 .

It is a cyclic number.

It is not a de Polignac number, because 43973989 - 2¹⁵ = 43941221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43973983) 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, 21986994 + 21986995.

It is an arithmetic number, because the mean of its divisors is an integer number (21986995).

Almost surely, 2^43973989 is an apocalyptic number.

It is an amenable number.

43973989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43973989 is an equidigital number, since it uses as much as digits as its factorization.

43973989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 52.

The square root of 43973989 is about 6631.2886379647. The cubic root of 43973989 is about 352.9652532360.

The spelling of 43973989 in words is "forty-three million, nine hundred seventy-three thousand, nine hundred eighty-nine".