999980986 has 8 divisors (see below), whose sum is σ = 1502666100. Its totient is φ = 499092288.

The previous prime is 999980923. The next prime is 999981011. The reversal of 999980986 is 689089999.

It can be written as a sum of positive squares in 2 ways, for example, as 993825625 + 6155361 = 31525^2 + 2481^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447711 + ... + 449938.

Almost surely, 2^999980986 is an apocalyptic number.

999980986 is a deficient number, since it is larger than the sum of its proper divisors (502685114).

999980986 is a wasteful number, since it uses less digits than its factorization.

999980986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898208.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The square root of 999980986 is about 31622.4759625175. The cubic root of 999980986 is about 999.9936619598.

The spelling of 999980986 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, nine hundred eighty-six".