43898989 has 2 divisors, whose sum is σ = 43898990. Its totient is φ = 43898988.

The previous prime is 43898977. The next prime is 43899013. The reversal of 43898989 is 98989834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37920964 + 5978025 = 6158^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 43898989 - 2¹³ = 43890797 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43898969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21949494 + 21949495.

It is an arithmetic number, because the mean of its divisors is an integer number (21949495).

Almost surely, 2^43898989 is an apocalyptic number.

It is an amenable number.

43898989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43898989 is an equidigital number, since it uses as much as digits as its factorization.

43898989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4478976, while the sum is 58.

The square root of 43898989 is about 6625.6312152126. The cubic root of 43898989 is about 352.7644719795.

The spelling of 43898989 in words is "forty-three million, eight hundred ninety-eight thousand, nine hundred eighty-nine".