989894369 has 2 divisors, whose sum is σ = 989894370. Its totient is φ = 989894368.

The previous prime is 989894333. The next prime is 989894371. The reversal of 989894369 is 963498989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881317969 + 108576400 = 29687^2 + 10420^2 .

It is a cyclic number.

It is not a de Polignac number, because 989894369 - 2¹² = 989890273 is a prime.

It is a super-2 number, since 2×989894369² = 1959781723555816322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 989894371, it forms a pair of twin primes.

It is a Chen prime.

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

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (989894329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494947184 + 494947185.

It is an arithmetic number, because the mean of its divisors is an integer number (494947185).

Almost surely, 2^989894369 is an apocalyptic number.

It is an amenable number.

989894369 is a deficient number, since it is larger than the sum of its proper divisors (1).

989894369 is an equidigital number, since it uses as much as digits as its factorization.

989894369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30233088, while the sum is 65.

The square root of 989894369 is about 31462.5868135473. The cubic root of 989894369 is about 996.6200451092.

The spelling of 989894369 in words is "nine hundred eighty-nine million, eight hundred ninety-four thousand, three hundred sixty-nine".