3999685 has 8 divisors (see below), whose sum is σ = 4820256. Its totient is φ = 3186000.

The previous prime is 3999683. The next prime is 3999703. The reversal of 3999685 is 5869993.

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

It is not a de Polignac number, because 3999685 - 2¹ = 3999683 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999683) 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, 339 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (602532).

Almost surely, 2^3999685 is an apocalyptic number.

It is an amenable number.

3999685 is a deficient number, since it is larger than the sum of its proper divisors (820571).

3999685 is a wasteful number, since it uses less digits than its factorization.

3999685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443.

The product of its digits is 524880, while the sum is 49.

The square root of 3999685 is about 1999.9212484495. The cubic root of 3999685 is about 158.7359381597.

The spelling of 3999685 in words is "three million, nine hundred ninety-nine thousand, six hundred eighty-five".