99840665 has 8 divisors (see below), whose sum is σ = 119883840. Its totient is φ = 79822512.

The previous prime is 99840661. The next prime is 99840667. The reversal of 99840665 is 56604899.

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 99840665 - 2² = 99840661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99840661) 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, 4082 + ... + 14708.

It is an arithmetic number, because the mean of its divisors is an integer number (14985480).

Almost surely, 2^99840665 is an apocalyptic number.

It is an amenable number.

99840665 is a deficient number, since it is larger than the sum of its proper divisors (20043175).

99840665 is a wasteful number, since it uses less digits than its factorization.

99840665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12511.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 99840665 is about 9992.0300740140. The cubic root of 99840665 is about 463.9122297941.

The spelling of 99840665 in words is "ninety-nine million, eight hundred forty thousand, six hundred sixty-five".