99935987 has 4 divisors (see below), whose sum is σ = 100007160. Its totient is φ = 99864816.

The previous prime is 99935977. The next prime is 99936019. The reversal of 99935987 is 78953999.

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

It is a cyclic number.

It is not a de Polignac number, because 99935987 - 2⁶ = 99935923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99935917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33437 + ... + 36302.

It is an arithmetic number, because the mean of its divisors is an integer number (25001790).

Almost surely, 2^99935987 is an apocalyptic number.

99935987 is a deficient number, since it is larger than the sum of its proper divisors (71173).

99935987 is a wasteful number, since it uses less digits than its factorization.

99935987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71172.

The product of its digits is 5511240, while the sum is 59.

The square root of 99935987 is about 9996.7988376280. The cubic root of 99935987 is about 464.0598215455.

The spelling of 99935987 in words is "ninety-nine million, nine hundred thirty-five thousand, nine hundred eighty-seven".