989598921 has 16 divisors (see below), whose sum is σ = 1335905280. Its totient is φ = 651530880.

The previous prime is 989598889. The next prime is 989598931. The reversal of 989598921 is 129895989.

It is not a de Polignac number, because 989598921 - 2⁵ = 989598889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989598931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290136 + ... + 293526.

It is an arithmetic number, because the mean of its divisors is an integer number (83494080).

Almost surely, 2^989598921 is an apocalyptic number.

It is an amenable number.

989598921 is a deficient number, since it is larger than the sum of its proper divisors (346306359).

989598921 is a wasteful number, since it uses less digits than its factorization.

989598921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4576.

The product of its digits is 4199040, while the sum is 60.

The square root of 989598921 is about 31457.8912357456. The cubic root of 989598921 is about 996.5208834521.

It can be divided in two parts, 98959 and 8921, that added together give a triangular number (107880 = T₄₆₄).

The spelling of 989598921 in words is "nine hundred eighty-nine million, five hundred ninety-eight thousand, nine hundred twenty-one".