998906866 has 8 divisors (see below), whose sum is σ = 1500170220. Its totient is φ = 498850128.

The previous prime is 998906863. The next prime is 998906891. The reversal of 998906866 is 668609899.

It can be written as a sum of positive squares in 2 ways, for example, as 920212225 + 78694641 = 30335^2 + 8871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

998906866 is a strobogrammatic number because it is the same when read upside-down.

It is not an unprimeable number, because it can be changed into a prime (998906861) 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, 299581 + ... + 302896.

Almost surely, 2^998906866 is an apocalyptic number.

998906866 is a deficient number, since it is larger than the sum of its proper divisors (501263354).

998906866 is a wasteful number, since it uses less digits than its factorization.

998906866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603308.

The product of its (nonzero) digits is 10077696, while the sum is 61.

The square root of 998906866 is about 31605.4879095387. The cubic root of 998906866 is about 999.6354891480.

The spelling of 998906866 in words is "nine hundred ninety-eight million, nine hundred six thousand, eight hundred sixty-six".