99999618 has 32 divisors (see below), whose sum is σ = 204070272. Its totient is φ = 32659200.

The previous prime is 99999617. The next prime is 99999623. The reversal of 99999618 is 81699999.

It is not an unprimeable number, because it can be changed into a prime (99999611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158163 + ... + 158793.

It is an arithmetic number, because the mean of its divisors is an integer number (6377196).

Almost surely, 2^99999618 is an apocalyptic number.

99999618 is an abundant number, since it is smaller than the sum of its proper divisors (104070654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999618 is a wasteful number, since it uses less digits than its factorization.

99999618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130.

The product of its digits is 2834352, while the sum is 60.

The square root of 99999618 is about 9999.9808999818. The cubic root of 99999618 is about 464.1582923315.

The spelling of 99999618 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred eighteen".