989996893 has 2 divisors, whose sum is σ = 989996894. Its totient is φ = 989996892.

The previous prime is 989996863. The next prime is 989996923. The reversal of 989996893 is 398699989.

989996893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (989996863) and next prime (989996923).

It can be written as a sum of positive squares in only one way, i.e., 939912964 + 50083929 = 30658^2 + 7077^2 .

It is an emirp because it is prime and its reverse (398699989) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989996893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989996803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494998446 + 494998447.

It is an arithmetic number, because the mean of its divisors is an integer number (494998447).

Almost surely, 2^989996893 is an apocalyptic number.

It is an amenable number.

989996893 is a deficient number, since it is larger than the sum of its proper divisors (1).

989996893 is an equidigital number, since it uses as much as digits as its factorization.

989996893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68024448, while the sum is 70.

The square root of 989996893 is about 31464.2160715947. The cubic root of 989996893 is about 996.6544507823.

The spelling of 989996893 in words is "nine hundred eighty-nine million, nine hundred ninety-six thousand, eight hundred ninety-three".