99129986 has 4 divisors (see below), whose sum is σ = 148694982. Its totient is φ = 49564992.

The previous prime is 99129983. The next prime is 99129991. The reversal of 99129986 is 68992199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 58997761 + 40132225 = 7681^2 + 6335^2 .

It is not an unprimeable number, because it can be changed into a prime (99129983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24782495 + ... + 24782498.

Almost surely, 2^99129986 is an apocalyptic number.

99129986 is a deficient number, since it is larger than the sum of its proper divisors (49564996).

99129986 is a wasteful number, since it uses less digits than its factorization.

99129986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49564995.

The product of its digits is 629856, while the sum is 53.

The square root of 99129986 is about 9956.4042706190. The cubic root of 99129986 is about 462.8088782586.

The spelling of 99129986 in words is "ninety-nine million, one hundred twenty-nine thousand, nine hundred eighty-six".