998855817 has 8 divisors (see below), whose sum is σ = 1364291040. Its totient is φ = 649662240.

The previous prime is 998855813. The next prime is 998855827. The reversal of 998855817 is 718558899.

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

It is not a de Polignac number, because 998855817 - 2² = 998855813 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 4060267 + ... + 4060512.

It is an arithmetic number, because the mean of its divisors is an integer number (170536380).

Almost surely, 2^998855817 is an apocalyptic number.

It is an amenable number.

998855817 is a deficient number, since it is larger than the sum of its proper divisors (365435223).

998855817 is a wasteful number, since it uses less digits than its factorization.

998855817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8120823.

The product of its digits is 7257600, while the sum is 60.

The square root of 998855817 is about 31604.6803021325. The cubic root of 998855817 is about 999.6184601125.

The spelling of 998855817 in words is "nine hundred ninety-eight million, eight hundred fifty-five thousand, eight hundred seventeen".