1998299819 has 4 divisors (see below), whose sum is σ = 2003517696. Its totient is φ = 1993081944.

The previous prime is 1998299803. The next prime is 1998299887. The reversal of 1998299819 is 9189928991.

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 1998299819 - 2⁴ = 1998299803 is a prime.

It is a super-2 number, since 2×1998299819² = 7986404333230865522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998299519) 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, 2608364 + ... + 2609129.

It is an arithmetic number, because the mean of its divisors is an integer number (500879424).

Almost surely, 2^1998299819 is an apocalyptic number.

1998299819 is a deficient number, since it is larger than the sum of its proper divisors (5217877).

1998299819 is an equidigital number, since it uses as much as digits as its factorization.

1998299819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5217876.

The product of its digits is 7558272, while the sum is 65.

The square root of 1998299819 is about 44702.3469070697. The cubic root of 1998299819 is about 1259.5639330434.

The spelling of 1998299819 in words is "one billion, nine hundred ninety-eight million, two hundred ninety-nine thousand, eight hundred nineteen".