99939 has 8 divisors (see below), whose sum is σ = 152320. Its totient is φ = 57096.

The previous prime is 99929. The next prime is 99961. The reversal of 99939 is 93999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99939 - 2⁴ = 99923 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 99897 and 99906.

It is not an unprimeable number, because it can be changed into a prime (99929) 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, 2359 + ... + 2400.

It is an arithmetic number, because the mean of its divisors is an integer number (19040).

2⁹⁹⁹³⁹ is an apocalyptic number.

99939 is a deficient number, since it is larger than the sum of its proper divisors (52381).

99939 is a wasteful number, since it uses less digits than its factorization.

99939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769.

The product of its digits is 19683, while the sum is 39.

The square root of 99939 is about 316.1313018352. The cubic root of 99939 is about 46.4064485191.

The spelling of 99939 in words is "ninety-nine thousand, nine hundred thirty-nine".