39686467889 has 2 divisors, whose sum is σ = 39686467890. Its totient is φ = 39686467888.

The previous prime is 39686467829. The next prime is 39686467907. The reversal of 39686467889 is 98876468693.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39683827264 + 2640625 = 199208^2 + 1625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39686467889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39686467829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19843233944 + 19843233945.

It is an arithmetic number, because the mean of its divisors is an integer number (19843233945).

Almost surely, 2^39686467889 is an apocalyptic number.

It is an amenable number.

39686467889 is a deficient number, since it is larger than the sum of its proper divisors (1).

39686467889 is an equidigital number, since it uses as much as digits as its factorization.

39686467889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752467968, while the sum is 74.

The spelling of 39686467889 in words is "thirty-nine billion, six hundred eighty-six million, four hundred sixty-seven thousand, eight hundred eighty-nine".