999972986 has 8 divisors (see below), whose sum is σ = 1501252704. Its totient is φ = 499555420.

The previous prime is 999972979. The next prime is 999973033. The reversal of 999972986 is 689279999.

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, 212630 + ... + 217281.

It is an arithmetic number, because the mean of its divisors is an integer number (187656588).

Almost surely, 2^999972986 is an apocalyptic number.

999972986 is a deficient number, since it is larger than the sum of its proper divisors (501279718).

999972986 is a wasteful number, since it uses less digits than its factorization.

999972986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431076.

The product of its digits is 39680928, while the sum is 68.

The square root of 999972986 is about 31622.3494699556. The cubic root of 999972986 is about 999.9909952522.

The spelling of 999972986 in words is "nine hundred ninety-nine million, nine hundred seventy-two thousand, nine hundred eighty-six".