3966239 has 2 divisors, whose sum is σ = 3966240. Its totient is φ = 3966238.

The previous prime is 3966229. The next prime is 3966247. The reversal of 3966239 is 9326693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3966239 - 2⁴ = 3966223 is a prime.

It is a super-3 number, since 3×3966239³ (a number of 21 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3966229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1983119 + 1983120.

It is an arithmetic number, because the mean of its divisors is an integer number (1983120).

Almost surely, 2^3966239 is an apocalyptic number.

3966239 is a deficient number, since it is larger than the sum of its proper divisors (1).

3966239 is an equidigital number, since it uses as much as digits as its factorization.

3966239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 38.

The square root of 3966239 is about 1991.5418649880. The cubic root of 3966239 is about 158.2922407365.

The spelling of 3966239 in words is "three million, nine hundred sixty-six thousand, two hundred thirty-nine".