999747998 has 8 divisors (see below), whose sum is σ = 1531528992. Its totient is φ = 489238336.

The previous prime is 999747989. The next prime is 999748007. The reversal of 999747998 is 899747999.

It is an interprime number because it is at equal distance from previous prime (999747989) and next prime (999748007).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 5317715 + ... + 5317902.

It is an arithmetic number, because the mean of its divisors is an integer number (191441124).

Almost surely, 2^999747998 is an apocalyptic number.

999747998 is a deficient number, since it is larger than the sum of its proper divisors (531780994).

999747998 is a wasteful number, since it uses less digits than its factorization.

999747998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10635666.

The product of its digits is 92588832, while the sum is 71.

The square root of 999747998 is about 31618.7918491520. The cubic root of 999747998 is about 999.9159922762.

Subtracting from 999747998 its reverse (899747999), we obtain a palindrome (99999999).

The spelling of 999747998 in words is "nine hundred ninety-nine million, seven hundred forty-seven thousand, nine hundred ninety-eight".