818899999 has 16 divisors (see below), whose sum is σ = 889344000. Its totient is φ = 752139360.

The previous prime is 818899987. The next prime is 818900053. The reversal of 818899999 is 999998818.

It is not a de Polignac number, because 818899999 - 2²³ = 810511391 is a prime.

It is a Duffinian number.

818899999 is a modest number, since divided by 99999 gives 8188 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818899909) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 45322 + ... + 60760.

It is an arithmetic number, because the mean of its divisors is an integer number (55584000).

Almost surely, 2^818899999 is an apocalyptic number.

818899999 is a deficient number, since it is larger than the sum of its proper divisors (70444001).

818899999 is a wasteful number, since it uses less digits than its factorization.

818899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15558.

The product of its digits is 30233088, while the sum is 70.

The square root of 818899999 is about 28616.4288303066. The cubic root of 818899999 is about 935.5714424588.

The spelling of 818899999 in words is "eight hundred eighteen million, eight hundred ninety-nine thousand, nine hundred ninety-nine".