998820809 has 8 divisors (see below), whose sum is σ = 1172361408. Its totient is φ = 832993200.

The previous prime is 998820799. The next prime is 998820811. The reversal of 998820809 is 908028899.

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

It is a cyclic number.

It is not a de Polignac number, because 998820809 - 2¹² = 998816713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998820409) 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, 1927967 + ... + 1928484.

It is an arithmetic number, because the mean of its divisors is an integer number (146545176).

Almost surely, 2^998820809 is an apocalyptic number.

It is an amenable number.

998820809 is a deficient number, since it is larger than the sum of its proper divisors (173540599).

998820809 is a wasteful number, since it uses less digits than its factorization.

998820809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856495.

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 998820809 is about 31604.1264552590. The cubic root of 998820809 is about 999.6067817330.

The spelling of 998820809 in words is "nine hundred ninety-eight million, eight hundred twenty thousand, eight hundred nine".