3947399 has 4 divisors (see below), whose sum is σ = 3957240. Its totient is φ = 3937560.

The previous prime is 3947369. The next prime is 3947401. The reversal of 3947399 is 9937493.

It is a happy number.

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 3947399 - 2⁸ = 3947143 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 (3947309) 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 3 ways as a sum of consecutive naturals, for example, 4292 + ... + 5129.

It is an arithmetic number, because the mean of its divisors is an integer number (989310).

Almost surely, 2^3947399 is an apocalyptic number.

3947399 is a deficient number, since it is larger than the sum of its proper divisors (9841).

3947399 is an equidigital number, since it uses as much as digits as its factorization.

3947399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840.

The product of its digits is 183708, while the sum is 44.

The square root of 3947399 is about 1986.8062311157. The cubic root of 3947399 is about 158.0412086072.

The spelling of 3947399 in words is "three million, nine hundred forty-seven thousand, three hundred ninety-nine".