3999947 has 8 divisors (see below), whose sum is σ = 4840416. Its totient is φ = 3226752.

The previous prime is 3999929. The next prime is 3999949. The reversal of 3999947 is 7499993.

3999947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3999947 - 2¹² = 3995851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3999895 and 3999904.

It is not an unprimeable number, because it can be changed into a prime (3999949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16688 + ... + 16925.

It is an arithmetic number, because the mean of its divisors is an integer number (605052).

Almost surely, 2^3999947 is an apocalyptic number.

3999947 is a deficient number, since it is larger than the sum of its proper divisors (840469).

3999947 is a wasteful number, since it uses less digits than its factorization.

3999947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33637.

The product of its digits is 551124, while the sum is 50.

The square root of 3999947 is about 1999.9867499561. The cubic root of 3999947 is about 158.7394040916.

The spelling of 3999947 in words is "three million, nine hundred ninety-nine thousand, nine hundred forty-seven".