43442989 has 2 divisors, whose sum is σ = 43442990. Its totient is φ = 43442988.

The previous prime is 43442977. The next prime is 43443011. The reversal of 43442989 is 98924434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40220964 + 3222025 = 6342^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 43442989 - 2¹¹ = 43440941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43442909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21721494 + 21721495.

It is an arithmetic number, because the mean of its divisors is an integer number (21721495).

Almost surely, 2^43442989 is an apocalyptic number.

It is an amenable number.

43442989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43442989 is an equidigital number, since it uses as much as digits as its factorization.

43442989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 43.

The square root of 43442989 is about 6591.1295693530. The cubic root of 43442989 is about 351.5387731767.

The spelling of 43442989 in words is "forty-three million, four hundred forty-two thousand, nine hundred eighty-nine".