43994989 has 2 divisors, whose sum is σ = 43994990. Its totient is φ = 43994988.

The previous prime is 43994987. The next prime is 43995037. The reversal of 43994989 is 98949934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35497764 + 8497225 = 5958^2 + 2915^2 .

It is a cyclic number.

It is not a de Polignac number, because 43994989 - 2¹ = 43994987 is a prime.

It is a super-2 number, since 2×43994989² = 3871118114220242, which contains 22 as substring.

Together with 43994987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43994987) 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, 21997494 + 21997495.

It is an arithmetic number, because the mean of its divisors is an integer number (21997495).

Almost surely, 2^43994989 is an apocalyptic number.

It is an amenable number.

43994989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43994989 is an equidigital number, since it uses as much as digits as its factorization.

43994989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 55.

The square root of 43994989 is about 6632.8718516190. The cubic root of 43994989 is about 353.0214310727.

It can be divided in two parts, 4 and 3994989, that added together give a palindrome (3994993).

The spelling of 43994989 in words is "forty-three million, nine hundred ninety-four thousand, nine hundred eighty-nine".