84432989 has 2 divisors, whose sum is σ = 84432990. Its totient is φ = 84432988.

The previous prime is 84432983. The next prime is 84433003. The reversal of 84432989 is 98923448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82500889 + 1932100 = 9083^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 84432989 - 2²⁴ = 67655773 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84432983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42216494 + 42216495.

It is an arithmetic number, because the mean of its divisors is an integer number (42216495).

Almost surely, 2^84432989 is an apocalyptic number.

It is an amenable number.

84432989 is a deficient number, since it is larger than the sum of its proper divisors (1).

84432989 is an equidigital number, since it uses as much as digits as its factorization.

84432989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 47.

The square root of 84432989 is about 9188.7425146208. The cubic root of 84432989 is about 438.7031182338.

It can be divided in two parts, 844 and 32989, that added together give a palindrome (33833).

The spelling of 84432989 in words is "eighty-four million, four hundred thirty-two thousand, nine hundred eighty-nine".