999857818 has 8 divisors (see below), whose sum is σ = 1548167040. Its totient is φ = 483802140.

The previous prime is 999857809. The next prime is 999857851. The reversal of 999857818 is 818758999.

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

It is a super-2 number, since 2×999857818² = 1999431312431442248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999857818.

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 3 ways as a sum of consecutive naturals, for example, 8063308 + ... + 8063431.

It is an arithmetic number, because the mean of its divisors is an integer number (193520880).

Almost surely, 2^999857818 is an apocalyptic number.

999857818 is a deficient number, since it is larger than the sum of its proper divisors (548309222).

999857818 is a wasteful number, since it uses less digits than its factorization.

999857818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16126772.

The product of its digits is 13063680, while the sum is 64.

The square root of 999857818 is about 31620.5284269571. The cubic root of 999857818 is about 999.9526037536.

The spelling of 999857818 in words is "nine hundred ninety-nine million, eight hundred fifty-seven thousand, eight hundred eighteen".