9825399905890 has 32 divisors (see below), whose sum is σ = 18208040406336. Its totient is φ = 3815210185920.

The previous prime is 9825399905879. The next prime is 9825399905897. The reversal of 9825399905890 is 985099935289.

It is not an unprimeable number, because it can be changed into a prime (9825399905897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70021221 + ... + 70161400.

It is an arithmetic number, because the mean of its divisors is an integer number (569001262698).

Almost surely, 2^{9825399905890} is an apocalyptic number.

9825399905890 is a deficient number, since it is larger than the sum of its proper divisors (8382640500446).

9825399905890 is a wasteful number, since it uses less digits than its factorization.

9825399905890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140182834.

The product of its (nonzero) digits is 566870400, while the sum is 76.

The spelling of 9825399905890 in words is "nine trillion, eight hundred twenty-five billion, three hundred ninety-nine million, nine hundred five thousand, eight hundred ninety".