99838 has 4 divisors (see below), whose sum is σ = 149760. Its totient is φ = 49918.

The previous prime is 99833. The next prime is 99839. The reversal of 99838 is 83899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83899 = 53 ⋅1583.

It is a junction number, because it is equal to n+sod(n) for n = 99797 and 99806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99833) by changing a digit.

99838 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24958 + ... + 24961.

It is an arithmetic number, because the mean of its divisors is an integer number (37440).

2⁹⁹⁸³⁸ is an apocalyptic number.

99838 is a deficient number, since it is larger than the sum of its proper divisors (49922).

99838 is a wasteful number, since it uses less digits than its factorization.

99838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49921.

The product of its digits is 15552, while the sum is 37.

The square root of 99838 is about 315.9715177037. The cubic root of 99838 is about 46.3908102094.

The spelling of 99838 in words is "ninety-nine thousand, eight hundred thirty-eight".