99129789 has 12 divisors (see below), whose sum is σ = 156204672. Its totient is φ = 60078600.

The previous prime is 99129787. The next prime is 99129799. The reversal of 99129789 is 98792199.

It is not a de Polignac number, because 99129789 - 2¹ = 99129787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99129781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 500557 + ... + 500754.

It is an arithmetic number, because the mean of its divisors is an integer number (13017056).

Almost surely, 2^99129789 is an apocalyptic number.

99129789 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

99129789 is a deficient number, since it is larger than the sum of its proper divisors (57074883).

99129789 is a wasteful number, since it uses less digits than its factorization.

99129789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001328 (or 1001325 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 99129789 is about 9956.3943774843. The cubic root of 99129789 is about 462.8085716800.

It can be divided in two parts, 9912 and 9789, that added together give a triangular number (19701 = T₁₉₈).

The spelling of 99129789 in words is "ninety-nine million, one hundred twenty-nine thousand, seven hundred eighty-nine".