3986839 has 2 divisors, whose sum is σ = 3986840. Its totient is φ = 3986838.

The previous prime is 3986813. The next prime is 3986897. The reversal of 3986839 is 9386893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3986839 - 2⁷ = 3986711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3986809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993419 + 1993420.

It is an arithmetic number, because the mean of its divisors is an integer number (1993420).

Almost surely, 2^3986839 is an apocalyptic number.

3986839 is a deficient number, since it is larger than the sum of its proper divisors (1).

3986839 is an equidigital number, since it uses as much as digits as its factorization.

3986839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 3986839 is about 1996.7070391021. The cubic root of 3986839 is about 158.5658156944.

The spelling of 3986839 in words is "three million, nine hundred eighty-six thousand, eight hundred thirty-nine".