998617847 has 4 divisors (see below), whose sum is σ = 1006241016. Its totient is φ = 990994680.

The previous prime is 998617819. The next prime is 998617877. The reversal of 998617847 is 748716899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748716899 = 7 ⋅106959557.

It is a cyclic number.

It is not a de Polignac number, because 998617847 - 2⁶ = 998617783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998617877) 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, 3811388 + ... + 3811649.

It is an arithmetic number, because the mean of its divisors is an integer number (251560254).

Almost surely, 2^998617847 is an apocalyptic number.

998617847 is a deficient number, since it is larger than the sum of its proper divisors (7623169).

998617847 is a wasteful number, since it uses less digits than its factorization.

998617847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7623168.

The product of its digits is 6096384, while the sum is 59.

The square root of 998617847 is about 31600.9152873774. The cubic root of 998617847 is about 999.5390699094.

The spelling of 998617847 in words is "nine hundred ninety-eight million, six hundred seventeen thousand, eight hundred forty-seven".