993998999 has 4 divisors (see below), whose sum is σ = 1135998864. Its totient is φ = 851999136.

The previous prime is 993998989. The next prime is 993999001. The reversal of 993998999 is 999899399.

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 993998999 - 2⁸ = 993998743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993998909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70999922 + ... + 70999935.

It is an arithmetic number, because the mean of its divisors is an integer number (283999716).

Almost surely, 2^993998999 is an apocalyptic number.

993998999 is a deficient number, since it is larger than the sum of its proper divisors (141999865).

993998999 is a wasteful number, since it uses less digits than its factorization.

993998999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141999864.

The product of its digits is 114791256, while the sum is 74.

The square root of 993998999 is about 31527.7496659689. The cubic root of 993998999 is about 997.9956516049.

The spelling of 993998999 in words is "nine hundred ninety-three million, nine hundred ninety-eight thousand, nine hundred ninety-nine".