998140865 has 16 divisors (see below), whose sum is σ = 1228220496. Its totient is φ = 778444800.

The previous prime is 998140861. The next prime is 998140903. The reversal of 998140865 is 568041899.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 169104016 + 829036849 = 13004^2 + 28793^2 .

It is not a de Polignac number, because 998140865 - 2² = 998140861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998140861) 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 15 ways as a sum of consecutive naturals, for example, 19985 + ... + 48945.

It is an arithmetic number, because the mean of its divisors is an integer number (76763781).

Almost surely, 2^998140865 is an apocalyptic number.

It is an amenable number.

998140865 is a deficient number, since it is larger than the sum of its proper divisors (230079631).

998140865 is a wasteful number, since it uses less digits than its factorization.

998140865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29140.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 998140865 is about 31593.3674210268. The cubic root of 998140865 is about 999.3799038936.

The spelling of 998140865 in words is "nine hundred ninety-eight million, one hundred forty thousand, eight hundred sixty-five".