999998208910540 has 72 divisors (see below), whose sum is σ = 2442959884945440. Its totient is φ = 342841494739968.

The previous prime is 999998208910517. The next prime is 999998208910573. The reversal of 999998208910540 is 45019802899999.

999998208910540 is a nontrivial binomial coefficient, being equal to C(44721320, 2).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1 + ... + 44721319.

It is an arithmetic number, because the mean of its divisors is an integer number (33929998402020).

Almost surely, 2^{999998208910540} is an apocalyptic number.

999998208910540 is the 44721319-th triangular number and also the 22360660-th hexagonal number.

999998208910540 is the 14907107-th centered nonagonal number.

It is an amenable number.

999998208910540 is an abundant number, since it is smaller than the sum of its proper divisors (1442961676034900).

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

999998208910540 is a wasteful number, since it uses less digits than its factorization.

999998208910540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44744159 (or 44744150 counting only the distinct ones).

The product of its (nonzero) digits is 1360488960, while the sum is 82.

The spelling of 999998208910540 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, two hundred eight million, nine hundred ten thousand, five hundred forty".