999981694 has 16 divisors (see below), whose sum is σ = 1549973376. Its totient is φ = 483357600.

The previous prime is 999981659. The next prime is 999981713. The reversal of 999981694 is 496189999.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 55404 + ... + 71200.

It is an arithmetic number, because the mean of its divisors is an integer number (96873336).

Almost surely, 2^999981694 is an apocalyptic number.

999981694 is a deficient number, since it is larger than the sum of its proper divisors (549991682).

999981694 is a wasteful number, since it uses less digits than its factorization.

999981694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16851.

The product of its digits is 11337408, while the sum is 64.

The square root of 999981694 is about 31622.4871570849. The cubic root of 999981694 is about 999.9938979628.

The spelling of 999981694 in words is "nine hundred ninety-nine million, nine hundred eighty-one thousand, six hundred ninety-four".