999998387795827 has 8 divisors (see below), whose sum is σ = 1142985067105536. Its totient is φ = 857044150177992.

The previous prime is 999998387795819. The next prime is 999998387795857. The reversal of 999998387795827 is 728597783899999.

It is a happy number.

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

It is not a de Polignac number, because 999998387795827 - 2³ = 999998387795819 is a prime.

It is a super-2 number, since 2×999998387795827² (a number of 31 digits) contains 22 as substring.

It is a pancake number, because a pancake can be divided into 999998387795827 parts by 44721323 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999998387795857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8110356913 + ... + 8110480210.

It is an arithmetic number, because the mean of its divisors is an integer number (142873133388192).

Almost surely, 2^{999998387795827} is an apocalyptic number.

999998387795827 is a deficient number, since it is larger than the sum of its proper divisors (142986679309709).

999998387795827 is a wasteful number, since it uses less digits than its factorization.

999998387795827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16220845937.

The product of its digits is 2799886279680, while the sum is 109.

The spelling of 999998387795827 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, three hundred eighty-seven million, seven hundred ninety-five thousand, eight hundred twenty-seven".