996989858 has 18 divisors (see below), whose sum is σ = 1519367889. Its totient is φ = 490658152.

The previous prime is 996989813. The next prime is 996989867. The reversal of 996989858 is 858989699.

It can be written as a sum of positive squares in 2 ways, for example, as 745672249 + 251317609 = 27307^2 + 15853^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=22327.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 996989791 and 996989800.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3706148 + ... + 3706416.

Almost surely, 2^996989858 is an apocalyptic number.

996989858 is a deficient number, since it is larger than the sum of its proper divisors (522378031).

996989858 is an frugal number, since it uses more digits than its factorization.

996989858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 354 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 71.

The square root of 996989858 is about 31575.1462071041. The cubic root of 996989858 is about 998.9956108736.

The spelling of 996989858 in words is "nine hundred ninety-six million, nine hundred eighty-nine thousand, eight hundred fifty-eight".