998994478726 has 8 divisors (see below), whose sum is σ = 1546830160704. Its totient is φ = 483384425160.

The previous prime is 998994478693. The next prime is 998994478793. The reversal of 998994478726 is 627874499899.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 998994478726.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8056407025 + ... + 8056407148.

It is an arithmetic number, because the mean of its divisors is an integer number (193353770088).

Almost surely, 2^998994478726 is an apocalyptic number.

998994478726 is a deficient number, since it is larger than the sum of its proper divisors (547835681978).

998994478726 is a wasteful number, since it uses less digits than its factorization.

998994478726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16112814206.

The product of its digits is 3950456832, while the sum is 82.

The spelling of 998994478726 in words is "nine hundred ninety-eight billion, nine hundred ninety-four million, four hundred seventy-eight thousand, seven hundred twenty-six".