3999109 has 2 divisors, whose sum is σ = 3999110. Its totient is φ = 3999108.

The previous prime is 3999067. The next prime is 3999113. The reversal of 3999109 is 9019993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3814209 + 184900 = 1953^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999109 - 2¹¹ = 3997061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999554 + 1999555.

It is an arithmetic number, because the mean of its divisors is an integer number (1999555).

Almost surely, 2^3999109 is an apocalyptic number.

It is an amenable number.

3999109 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999109 is an equidigital number, since it uses as much as digits as its factorization.

3999109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 3999109 is about 1999.7772375942. Note that the first 3 decimals coincide. The cubic root of 3999109 is about 158.7283178688.

The spelling of 3999109 in words is "three million, nine hundred ninety-nine thousand, one hundred nine".