99800819 has 4 divisors (see below), whose sum is σ = 101436960. Its totient is φ = 98164680.

The previous prime is 99800797. The next prime is 99800821. The reversal of 99800819 is 91800899.

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 99800819 - 2²⁰ = 98752243 is a prime.

It is a super-2 number, since 2×99800819² = 19920406946141522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99800819.

It is not an unprimeable number, because it can be changed into a prime (99800839) 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, 817979 + ... + 818100.

It is an arithmetic number, because the mean of its divisors is an integer number (25359240).

Almost surely, 2^99800819 is an apocalyptic number.

99800819 is a deficient number, since it is larger than the sum of its proper divisors (1636141).

99800819 is a wasteful number, since it uses less digits than its factorization.

99800819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636140.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 99800819 is about 9990.0359859212. The cubic root of 99800819 is about 463.8505064260.

The spelling of 99800819 in words is "ninety-nine million, eight hundred thousand, eight hundred nineteen".