3964399 has 2 divisors, whose sum is σ = 3964400. Its totient is φ = 3964398.

The previous prime is 3964397. The next prime is 3964421. The reversal of 3964399 is 9934693.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3964399 - 2¹ = 3964397 is a prime.

Together with 3964397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3964393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1982199 + 1982200.

It is an arithmetic number, because the mean of its divisors is an integer number (1982200).

Almost surely, 2^3964399 is an apocalyptic number.

3964399 is a deficient number, since it is larger than the sum of its proper divisors (1).

3964399 is an equidigital number, since it uses as much as digits as its factorization.

3964399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 43.

The square root of 3964399 is about 1991.0798577656. The cubic root of 3964399 is about 158.2677588723.

The spelling of 3964399 in words is "three million, nine hundred sixty-four thousand, three hundred ninety-nine".