99813789 has 10 divisors (see below), whose sum is σ = 149104670. Its totient is φ = 66542472.

The previous prime is 99813757. The next prime is 99813797. The reversal of 99813789 is 98731899.

It can be written as a sum of positive squares in only one way, i.e., 99800100 + 13689 = 9990^2 + 117^2 .

It is not a de Polignac number, because 99813789 - 2⁵ = 99813757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99813739) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 616054 + ... + 616215.

It is an arithmetic number, because the mean of its divisors is an integer number (14910467).

Almost surely, 2^99813789 is an apocalyptic number.

It is an amenable number.

99813789 is a deficient number, since it is larger than the sum of its proper divisors (49290881).

99813789 is a wasteful number, since it uses less digits than its factorization.

99813789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232281 (or 1232272 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 99813789 is about 9990.6851116427. The cubic root of 99813789 is about 463.8705993822.

The spelling of 99813789 in words is "ninety-nine million, eight hundred thirteen thousand, seven hundred eighty-nine".