989878793 has 2 divisors, whose sum is σ = 989878794. Its totient is φ = 989878792.

The previous prime is 989878783. The next prime is 989878801. The reversal of 989878793 is 397878989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 799079824 + 190798969 = 28268^2 + 13813^2 .

It is a cyclic number.

It is not a de Polignac number, because 989878793 - 2¹⁰ = 989877769 is a prime.

It is a super-2 number, since 2×989878793² = 1959720049662273698, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989878783) 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, 494939396 + 494939397.

It is an arithmetic number, because the mean of its divisors is an integer number (494939397).

Almost surely, 2^989878793 is an apocalyptic number.

It is an amenable number.

989878793 is a deficient number, since it is larger than the sum of its proper divisors (1).

989878793 is an equidigital number, since it uses as much as digits as its factorization.

989878793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 68.

The square root of 989878793 is about 31462.3392804794. The cubic root of 989878793 is about 996.6148178056.

The spelling of 989878793 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, seven hundred ninety-three".