39998 has 8 divisors (see below), whose sum is σ = 68592. Its totient is φ = 17136.

The previous prime is 39989. The next prime is 40009. The reversal of 39998 is 89993.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

39998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415 + ... + 1442.

It is an arithmetic number, because the mean of its divisors is an integer number (8574).

2³⁹⁹⁹⁸ is an apocalyptic number.

39998 is a deficient number, since it is larger than the sum of its proper divisors (28594).

39998 is a wasteful number, since it uses less digits than its factorization.

39998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866.

The product of its digits is 17496, while the sum is 38.

The square root of 39998 is about 199.9949999375. The cubic root of 39998 is about 34.1989489321.

It can be divided in two parts, 3 and 9998, that added together give a palindrome (10001).

The spelling of 39998 in words is "thirty-nine thousand, nine hundred ninety-eight".