3984809 has 2 divisors, whose sum is σ = 3984810. Its totient is φ = 3984808.

The previous prime is 3984793. The next prime is 3984823. The reversal of 3984809 is 9084893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2016400 + 1968409 = 1420^2 + 1403^2 .

It is a cyclic number.

It is not a de Polignac number, because 3984809 - 2⁴ = 3984793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3984859) 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 as a sum of consecutive naturals, namely, 1992404 + 1992405.

It is an arithmetic number, because the mean of its divisors is an integer number (1992405).

Almost surely, 2^3984809 is an apocalyptic number.

It is an amenable number.

3984809 is a deficient number, since it is larger than the sum of its proper divisors (1).

3984809 is an equidigital number, since it uses as much as digits as its factorization.

3984809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 3984809 is about 1996.1986374106. The cubic root of 3984809 is about 158.5388985257.

It can be divided in two parts, 39 and 84809, that added together give a palindrome (84848).

The spelling of 3984809 in words is "three million, nine hundred eighty-four thousand, eight hundred nine".