3939999 has 16 divisors (see below), whose sum is σ = 6031872. Its totient is φ = 2240928.

The previous prime is 3939997. The next prime is 3940009. The reversal of 3939999 is 9999393.

It is not a de Polignac number, because 3939999 - 2¹ = 3939997 is a prime.

3939999 is a modest number, since divided by 9999 gives 393 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7582 + ... + 8084.

It is an arithmetic number, because the mean of its divisors is an integer number (376992).

Almost surely, 2^3939999 is an apocalyptic number.

3939999 is a deficient number, since it is larger than the sum of its proper divisors (2091873).

3939999 is a wasteful number, since it uses less digits than its factorization.

3939999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886.

The product of its digits is 531441, while the sum is 51.

The square root of 3939999 is about 1984.9430722315. The cubic root of 3939999 is about 157.9423894007.

The spelling of 3939999 in words is "three million, nine hundred thirty-nine thousand, nine hundred ninety-nine".