671786939 has 2 divisors, whose sum is σ = 671786940. Its totient is φ = 671786938.

The previous prime is 671786923. The next prime is 671786987. The reversal of 671786939 is 939687176.

671786939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671786939 - 2⁴ = 671786923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671786989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335893469 + 335893470.

It is an arithmetic number, because the mean of its divisors is an integer number (335893470).

Almost surely, 2^671786939 is an apocalyptic number.

671786939 is a deficient number, since it is larger than the sum of its proper divisors (1).

671786939 is an equidigital number, since it uses as much as digits as its factorization.

671786939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 56.

The square root of 671786939 is about 25918.8529645893. The cubic root of 671786939 is about 875.8112482792.

The spelling of 671786939 in words is "six hundred seventy-one million, seven hundred eighty-six thousand, nine hundred thirty-nine".