999716686 has 4 divisors (see below), whose sum is σ = 1499575032. Its totient is φ = 499858342.

The previous prime is 999716621. The next prime is 999716693. The reversal of 999716686 is 686617999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 686617999 = 3373 ⋅203563.

It is a super-3 number, since 3×999716686³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249929170 + ... + 249929173.

It is an arithmetic number, because the mean of its divisors is an integer number (374893758).

Almost surely, 2^999716686 is an apocalyptic number.

999716686 is a deficient number, since it is larger than the sum of its proper divisors (499858346).

999716686 is a wasteful number, since it uses less digits than its factorization.

999716686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499858345.

The product of its digits is 8817984, while the sum is 61.

The square root of 999716686 is about 31618.2966966913. The cubic root of 999716686 is about 999.9055530801.

The spelling of 999716686 in words is "nine hundred ninety-nine million, seven hundred sixteen thousand, six hundred eighty-six".