999689684 has 12 divisors (see below), whose sum is σ = 1999379424. Its totient is φ = 428438424.

The previous prime is 999689683. The next prime is 999689729. The reversal of 999689684 is 486986999.

999689684 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999689681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17851574 + ... + 17851629.

It is an arithmetic number, because the mean of its divisors is an integer number (166614952).

Almost surely, 2^999689684 is an apocalyptic number.

It is an amenable number.

999689684 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999689684 is a wasteful number, since it uses less digits than its factorization.

999689684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35703214 (or 35703212 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 68.

The square root of 999689684 is about 31617.8696942093. The cubic root of 999689684 is about 999.8965506319.

The spelling of 999689684 in words is "nine hundred ninety-nine million, six hundred eighty-nine thousand, six hundred eighty-four".