998855818 has 8 divisors (see below), whose sum is σ = 1499291748. Its totient is φ = 499091904.

The previous prime is 998855813. The next prime is 998855827. The reversal of 998855818 is 818558899.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 997738569 + 1117249 = 31587^2 + 1057^2 .

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

It is not an unprimeable number, because it can be changed into a prime (998855813) 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, 164271 + ... + 170242.

Almost surely, 2^998855818 is an apocalyptic number.

998855818 is a deficient number, since it is larger than the sum of its proper divisors (500435930).

998855818 is a wasteful number, since it uses less digits than its factorization.

998855818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336008.

The product of its digits is 8294400, while the sum is 61.

The square root of 998855818 is about 31604.6803179529. The cubic root of 998855818 is about 999.6184604461.

The spelling of 998855818 in words is "nine hundred ninety-eight million, eight hundred fifty-five thousand, eight hundred eighteen".