99998993 has 4 divisors (see below), whose sum is σ = 100147380. Its totient is φ = 99850608.

The previous prime is 99998971. The next prime is 99998999. The reversal of 99998993 is 39989999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 70274689 + 29724304 = 8383^2 + 5452^2 .

It is a cyclic number.

It is not a de Polignac number, because 99998993 - 2⁶ = 99998929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99998999) 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, 73178 + ... + 74531.

It is an arithmetic number, because the mean of its divisors is an integer number (25036845).

Almost surely, 2^99998993 is an apocalyptic number.

It is an amenable number.

99998993 is a deficient number, since it is larger than the sum of its proper divisors (148387).

99998993 is a wasteful number, since it uses less digits than its factorization.

99998993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148386.

The product of its digits is 12754584, while the sum is 65.

The square root of 99998993 is about 9999.9496498732. The cubic root of 99998993 is about 464.1573253294.

The spelling of 99998993 in words is "ninety-nine million, nine hundred ninety-eight thousand, nine hundred ninety-three".