999398818418 has 64 divisors (see below), whose sum is σ = 2013054785280. Its totient is φ = 359374233600.

The previous prime is 999398818399. The next prime is 999398818471. The reversal of 999398818418 is 814818893999.

999398818418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (77).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16307738 + ... + 16368906.

It is an arithmetic number, because the mean of its divisors is an integer number (31453981020).

Almost surely, 2^999398818418 is an apocalyptic number.

999398818418 is an abundant number, since it is smaller than the sum of its proper divisors (1013655966862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999398818418 is a wasteful number, since it uses less digits than its factorization.

999398818418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69363.

The product of its digits is 322486272, while the sum is 77.

The spelling of 999398818418 in words is "nine hundred ninety-nine billion, three hundred ninety-eight million, eight hundred eighteen thousand, four hundred eighteen".