3999679 has 4 divisors (see below), whose sum is σ = 4010776. Its totient is φ = 3988584.

The previous prime is 3999661. The next prime is 3999683. The reversal of 3999679 is 9769993.

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

It is a cyclic number.

It is not a de Polignac number, because 3999679 - 2⁵ = 3999647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999629) 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, 4989 + ... + 5734.

It is an arithmetic number, because the mean of its divisors is an integer number (1002694).

Almost surely, 2^3999679 is an apocalyptic number.

3999679 is a deficient number, since it is larger than the sum of its proper divisors (11097).

3999679 is a wasteful number, since it uses less digits than its factorization.

3999679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11096.

The product of its digits is 826686, while the sum is 52.

The square root of 3999679 is about 1999.9197483899. The cubic root of 3999679 is about 158.7358587854.

The spelling of 3999679 in words is "three million, nine hundred ninety-nine thousand, six hundred seventy-nine".