99900789 has 16 divisors (see below), whose sum is σ = 142338240. Its totient is φ = 62104320.

The previous prime is 99900781. The next prime is 99900791. The reversal of 99900789 is 98700999.

It is not a de Polignac number, because 99900789 - 2³ = 99900781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99900781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3427 + ... + 14544.

It is an arithmetic number, because the mean of its divisors is an integer number (8896140).

Almost surely, 2^99900789 is an apocalyptic number.

It is an amenable number.

99900789 is a deficient number, since it is larger than the sum of its proper divisors (42437451).

99900789 is a wasteful number, since it uses less digits than its factorization.

99900789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18100.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 99900789 is about 9995.0382190365. The cubic root of 99900789 is about 464.0053336808.

The spelling of 99900789 in words is "ninety-nine million, nine hundred thousand, seven hundred eighty-nine".