998218979 has 4 divisors (see below), whose sum is σ = 1050756840. Its totient is φ = 945681120.

The previous prime is 998218973. The next prime is 998218981. The reversal of 998218979 is 979812899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979812899 = 13 ⋅75370223.

It is a cyclic number.

It is not a de Polignac number, because 998218979 - 2⁸ = 998218723 is a prime.

It is a super-2 number, since 2×998218979² = 1992882260071604882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998218973) 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, 26268902 + ... + 26268939.

It is an arithmetic number, because the mean of its divisors is an integer number (262689210).

Almost surely, 2^998218979 is an apocalyptic number.

998218979 is a deficient number, since it is larger than the sum of its proper divisors (52537861).

998218979 is a wasteful number, since it uses less digits than its factorization.

998218979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52537860.

The product of its digits is 5878656, while the sum is 62.

The square root of 998218979 is about 31594.6036373302. The cubic root of 998218979 is about 999.4059735358.

The spelling of 998218979 in words is "nine hundred ninety-eight million, two hundred eighteen thousand, nine hundred seventy-nine".