99599989 has 8 divisors (see below), whose sum is σ = 102228480. Its totient is φ = 97005216.

The previous prime is 99599977. The next prime is 99599999. The reversal of 99599989 is 98999599.

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 99599989 - 2⁷ = 99599861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99599999) 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, 2389 + ... + 14314.

It is an arithmetic number, because the mean of its divisors is an integer number (12778560).

Almost surely, 2^99599989 is an apocalyptic number.

It is an amenable number.

99599989 is a deficient number, since it is larger than the sum of its proper divisors (2628491).

99599989 is a wasteful number, since it uses less digits than its factorization.

99599989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16859.

The product of its digits is 21257640, while the sum is 67.

The square root of 99599989 is about 9979.9794087964. The cubic root of 99599989 is about 463.5391607755.

The spelling of 99599989 in words is "ninety-nine million, five hundred ninety-nine thousand, nine hundred eighty-nine".