999838997 has 8 divisors (see below), whose sum is σ = 1025340120. Its totient is φ = 974391040.

The previous prime is 999838963. The next prime is 999839017. The reversal of 999838997 is 799838999.

999838997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 89851441 + 909987556 = 9479^2 + 30166^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999838997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999838997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999838927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26279 + ... + 51867.

It is an arithmetic number, because the mean of its divisors is an integer number (128167515).

Almost surely, 2^999838997 is an apocalyptic number.

It is an amenable number.

999838997 is a deficient number, since it is larger than the sum of its proper divisors (25501123).

999838997 is a wasteful number, since it uses less digits than its factorization.

999838997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26583.

The product of its digits is 79361856, while the sum is 71.

The square root of 999838997 is about 31620.2308182594. The cubic root of 999838997 is about 999.9463294529.

The spelling of 999838997 in words is "nine hundred ninety-nine million, eight hundred thirty-eight thousand, nine hundred ninety-seven".