99509138 has 16 divisors (see below), whose sum is σ = 153273120. Its totient is φ = 48426336.

The previous prime is 99509131. The next prime is 99509159. The reversal of 99509138 is 83190599.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99509131) 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, 24518 + ... + 28286.

It is an arithmetic number, because the mean of its divisors is an integer number (9579570).

Almost surely, 2^99509138 is an apocalyptic number.

99509138 is a deficient number, since it is larger than the sum of its proper divisors (53763982).

99509138 is a wasteful number, since it uses less digits than its factorization.

99509138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4121.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 99509138 is about 9975.4267076652. The cubic root of 99509138 is about 463.3981774688.

The spelling of 99509138 in words is "ninety-nine million, five hundred nine thousand, one hundred thirty-eight".