99819 has 8 divisors (see below), whose sum is σ = 147920. Its totient is φ = 66528.

The previous prime is 99817. The next prime is 99823. The reversal of 99819 is 91899.

It is not a de Polignac number, because 99819 - 2¹ = 99817 is a prime.

It is a super-2 number, since 2×99819² = 19927665522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99817) 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, 1822 + ... + 1875.

It is an arithmetic number, because the mean of its divisors is an integer number (18490).

2⁹⁹⁸¹⁹ is an apocalyptic number.

99819 is a deficient number, since it is larger than the sum of its proper divisors (48101).

99819 is a wasteful number, since it uses less digits than its factorization.

99819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706 (or 3700 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 99819 is about 315.9414502720. The cubic root of 99819 is about 46.3878671706.

The spelling of 99819 in words is "ninety-nine thousand, eight hundred nineteen".