99909729 has 6 divisors (see below), whose sum is σ = 144314066. Its totient is φ = 66606480.

The previous prime is 99909721. The next prime is 99909739. The reversal of 99909729 is 92790999.

It can be written as a sum of positive squares in only one way, i.e., 97476129 + 2433600 = 9873^2 + 1560^2 .

It is not a de Polignac number, because 99909729 - 2³ = 99909721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99909721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5550532 + ... + 5550549.

Almost surely, 2^99909729 is an apocalyptic number.

It is an amenable number.

99909729 is a deficient number, since it is larger than the sum of its proper divisors (44404337).

99909729 is a wasteful number, since it uses less digits than its factorization.

99909729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101087 (or 11101084 counting only the distinct ones).

The product of its (nonzero) digits is 826686, while the sum is 54.

The square root of 99909729 is about 9995.4854309333. The cubic root of 99909729 is about 464.0191743587.

The spelling of 99909729 in words is "ninety-nine million, nine hundred nine thousand, seven hundred twenty-nine".