3999842 has 32 divisors (see below), whose sum is σ = 7879680. Its totient is φ = 1475280.

The previous prime is 3999803. The next prime is 3999851. The reversal of 3999842 is 2489993.

It is a junction number, because it is equal to n+sod(n) for n = 3999793 and 3999802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2243 + ... + 3609.

It is an arithmetic number, because the mean of its divisors is an integer number (246240).

Almost surely, 2^3999842 is an apocalyptic number.

3999842 is a deficient number, since it is larger than the sum of its proper divisors (3879838).

3999842 is a wasteful number, since it uses less digits than its factorization.

3999842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406.

The product of its digits is 139968, while the sum is 44.

The square root of 3999842 is about 1999.9604996099. The cubic root of 3999842 is about 158.7380150912.

The spelling of 3999842 in words is "three million, nine hundred ninety-nine thousand, eight hundred forty-two".