999998387795826 has 72 divisors (see below), whose sum is σ = 2223802718532720. Its totient is φ = 324762662658240.

The previous prime is 999998387795819. The next prime is 999998387795857. The reversal of 999998387795826 is 628597783899999.

999998387795826 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 98 + 387 + 79 + 58 + 2 + 6 = 666.

999998387795826 is a nontrivial binomial coefficient, being equal to C(44721324, 2).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1 + ... + 44721323.

It is an arithmetic number, because the mean of its divisors is an integer number (30886148868510).

Almost surely, 2^{999998387795826} is an apocalyptic number.

999998387795826 is the 44721323-rd triangular number and also the 22360662-nd hexagonal number.

999998387795826 is an abundant number, since it is smaller than the sum of its proper divisors (1223804330736894).

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

999998387795826 is a wasteful number, since it uses less digits than its factorization.

999998387795826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44722152 (or 44722108 counting only the distinct ones).

The product of its digits is 2399902525440, while the sum is 108.

The spelling of 999998387795826 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-six".