3989780657 has 2 divisors, whose sum is σ = 3989780658. Its totient is φ = 3989780656.

The previous prime is 3989780653. The next prime is 3989780689. The reversal of 3989780657 is 7560879893.

3989780657 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3988048801 + 1731856 = 63151^2 + 1316^2 .

It is a cyclic number.

It is not a de Polignac number, because 3989780657 - 2² = 3989780653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3989780657.

It is not a weakly prime, because it can be changed into another prime (3989780653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994890328 + 1994890329.

It is an arithmetic number, because the mean of its divisors is an integer number (1994890329).

Almost surely, 2^3989780657 is an apocalyptic number.

It is an amenable number.

3989780657 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989780657 is an equidigital number, since it uses as much as digits as its factorization.

3989780657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22861440, while the sum is 62.

The square root of 3989780657 is about 63164.7105352348. The cubic root of 3989780657 is about 1586.0480494277.

The spelling of 3989780657 in words is "three billion, nine hundred eighty-nine million, seven hundred eighty thousand, six hundred fifty-seven".