3999687 has 8 divisors (see below), whose sum is σ = 5397504. Its totient is φ = 2634168.

The previous prime is 3999683. The next prime is 3999703. The reversal of 3999687 is 7869993.

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

It is not a de Polignac number, because 3999687 - 2² = 3999683 is a prime.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7783 + ... + 8280.

It is an arithmetic number, because the mean of its divisors is an integer number (674688).

Almost surely, 2^3999687 is an apocalyptic number.

3999687 is a deficient number, since it is larger than the sum of its proper divisors (1397817).

3999687 is a wasteful number, since it uses less digits than its factorization.

3999687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16149.

The product of its digits is 734832, while the sum is 51.

The square root of 3999687 is about 1999.9217484692. The cubic root of 3999687 is about 158.7359646177.

The spelling of 3999687 in words is "three million, nine hundred ninety-nine thousand, six hundred eighty-seven".