998417879 has 16 divisors (see below), whose sum is σ = 1083601920. Its totient is φ = 917373600.

The previous prime is 998417863. The next prime is 998417891. The reversal of 998417879 is 978714899.

It is a cyclic number.

It is not a de Polignac number, because 998417879 - 2⁴ = 998417863 is a prime.

It is a super-2 number, since 2×998417879² = 1993676522213717282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998417809) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 59804 + ... + 74654.

It is an arithmetic number, because the mean of its divisors is an integer number (67725120).

Almost surely, 2^998417879 is an apocalyptic number.

998417879 is a deficient number, since it is larger than the sum of its proper divisors (85184041).

998417879 is a wasteful number, since it uses less digits than its factorization.

998417879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14990.

The product of its digits is 9144576, while the sum is 62.

The square root of 998417879 is about 31597.7511699804. The cubic root of 998417879 is about 999.4723479656.

The spelling of 998417879 in words is "nine hundred ninety-eight million, four hundred seventeen thousand, eight hundred seventy-nine".