989983717 has 4 divisors (see below), whose sum is σ = 994307020. Its totient is φ = 985660416.

The previous prime is 989983699. The next prime is 989983721. The reversal of 989983717 is 717389989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 717389989 = 467 ⋅1536167.

It can be written as a sum of positive squares in 2 ways, for example, as 503957601 + 486026116 = 22449^2 + 22046^2 .

It is a cyclic number.

It is not a de Polignac number, because 989983717 - 2¹¹ = 989981669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989983777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2161308 + ... + 2161765.

It is an arithmetic number, because the mean of its divisors is an integer number (248576755).

Almost surely, 2^989983717 is an apocalyptic number.

It is an amenable number.

989983717 is a deficient number, since it is larger than the sum of its proper divisors (4323303).

989983717 is a wasteful number, since it uses less digits than its factorization.

989983717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323302.

The product of its digits is 6858432, while the sum is 61.

The square root of 989983717 is about 31464.0066901849. The cubic root of 989983717 is about 996.6500292273.

The spelling of 989983717 in words is "nine hundred eighty-nine million, nine hundred eighty-three thousand, seven hundred seventeen".