99129979 has 8 divisors (see below), whose sum is σ = 106834112. Its totient is φ = 91437120.

The previous prime is 99129929. The next prime is 99129983. The reversal of 99129979 is 97992199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99129979 - 2⁷ = 99129851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99129929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27982 + ... + 31324.

It is an arithmetic number, because the mean of its divisors is an integer number (13354264).

Almost surely, 2^99129979 is an apocalyptic number.

99129979 is a deficient number, since it is larger than the sum of its proper divisors (7704133).

99129979 is a wasteful number, since it uses less digits than its factorization.

99129979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637.

The product of its digits is 826686, while the sum is 55.

The square root of 99129979 is about 9956.4039190864. The cubic root of 99129979 is about 462.8088673650.

It can be divided in two parts, 9912 and 9979, that added together give a palindrome (19891).

The spelling of 99129979 in words is "ninety-nine million, one hundred twenty-nine thousand, nine hundred seventy-nine".