939999 has 4 divisors (see below), whose sum is σ = 1253336. Its totient is φ = 626664.

The previous prime is 939997. The next prime is 940001. The reversal of 939999 is 999939.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (939997) and next prime (940001).

It is not a de Polignac number, because 939999 - 2¹ = 939997 is a prime.

It is a D-number.

It is a Duffinian number.

939999 is a modest number, since divided by 999 gives 939 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (939997) 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, 156664 + ... + 156669.

It is an arithmetic number, because the mean of its divisors is an integer number (313334).

2⁹³⁹⁹⁹⁹ is an apocalyptic number.

939999 is a deficient number, since it is larger than the sum of its proper divisors (313337).

939999 is a wasteful number, since it uses less digits than its factorization.

939999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313336.

The product of its digits is 177147, while the sum is 48.

The square root of 939999 is about 969.5354557725. The cubic root of 939999 is about 97.9585761344.

The spelling of 939999 in words is "nine hundred thirty-nine thousand, nine hundred ninety-nine".