989869973 has 2 divisors, whose sum is σ = 989869974. Its totient is φ = 989869972.

The previous prime is 989869967. The next prime is 989869987. The reversal of 989869973 is 379968989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 829036849 + 160833124 = 28793^2 + 12682^2 .

It is a cyclic number.

It is not a de Polignac number, because 989869973 - 2⁴ = 989869957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989869913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494934986 + 494934987.

It is an arithmetic number, because the mean of its divisors is an integer number (494934987).

Almost surely, 2^989869973 is an apocalyptic number.

It is an amenable number.

989869973 is a deficient number, since it is larger than the sum of its proper divisors (1).

989869973 is an equidigital number, since it uses as much as digits as its factorization.

989869973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52907904, while the sum is 68.

The square root of 989869973 is about 31462.1991125859. The cubic root of 989869973 is about 996.6118577904.

The spelling of 989869973 in words is "nine hundred eighty-nine million, eight hundred sixty-nine thousand, nine hundred seventy-three".