998747899 has 4 divisors (see below), whose sum is σ = 999064080. Its totient is φ = 998431720.

The previous prime is 998747891. The next prime is 998747917.

It is a happy number.

998747899 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 998747899 - 2³ = 998747891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998747891) 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, 153304 + ... + 159685.

It is an arithmetic number, because the mean of its divisors is an integer number (249766020).

Almost surely, 2^998747899 is an apocalyptic number.

998747899 is a deficient number, since it is larger than the sum of its proper divisors (316181).

998747899 is a wasteful number, since it uses less digits than its factorization.

998747899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316180.

The product of its digits is 82301184, while the sum is 70.

The square root of 998747899 is about 31602.9729455948. The cubic root of 998747899 is about 999.5824586835.

The spelling of 998747899 in words is "nine hundred ninety-eight million, seven hundred forty-seven thousand, eight hundred ninety-nine".