3999994 has 8 divisors (see below), whose sum is σ = 6315840. Its totient is φ = 1894716.

The previous prime is 3999971. The next prime is 4000037. The reversal of 3999994 is 4999993.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52594 + ... + 52669.

It is an arithmetic number, because the mean of its divisors is an integer number (789480).

Almost surely, 2^3999994 is an apocalyptic number.

3999994 is a deficient number, since it is larger than the sum of its proper divisors (2315846).

3999994 is a wasteful number, since it uses less digits than its factorization.

3999994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105284.

The product of its digits is 708588, while the sum is 52.

The square root of 3999994 is about 1999.9984999994. The cubic root of 3999994 is about 158.7400258267.

Subtracting 3999994 from its reverse (4999993), we obtain a palindrome (999999).

The spelling of 3999994 in words is "three million, nine hundred ninety-nine thousand, nine hundred ninety-four".