989618837 has 4 divisors (see below), whose sum is σ = 989816256. Its totient is φ = 989421420.

The previous prime is 989618801. The next prime is 989618843. The reversal of 989618837 is 738816989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 738816989 = 14779 ⋅49991.

It is a cyclic number.

It is not a de Polignac number, because 989618837 - 2¹⁰ = 989617813 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 (989618867) 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, 90989 + ... + 101282.

It is an arithmetic number, because the mean of its divisors is an integer number (247454064).

Almost surely, 2^989618837 is an apocalyptic number.

It is an amenable number.

989618837 is a deficient number, since it is larger than the sum of its proper divisors (197419).

989618837 is a wasteful number, since it uses less digits than its factorization.

989618837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197418.

The product of its digits is 5225472, while the sum is 59.

The square root of 989618837 is about 31458.2077842969. The cubic root of 989618837 is about 996.5275685095.

The spelling of 989618837 in words is "nine hundred eighty-nine million, six hundred eighteen thousand, eight hundred thirty-seven".