3989761 has 2 divisors, whose sum is σ = 3989762. Its totient is φ = 3989760.

The previous prime is 3989759. The next prime is 3989801. The reversal of 3989761 is 1679893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2250000 + 1739761 = 1500^2 + 1319^2 .

It is a cyclic number.

It is not a de Polignac number, because 3989761 - 2¹ = 3989759 is a prime.

Together with 3989759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3989701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994880 + 1994881.

It is an arithmetic number, because the mean of its divisors is an integer number (1994881).

Almost surely, 2^3989761 is an apocalyptic number.

It is an amenable number.

3989761 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989761 is an equidigital number, since it uses as much as digits as its factorization.

3989761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 3989761 is about 1997.4386098201. The cubic root of 3989761 is about 158.6045444690.

The spelling of 3989761 in words is "three million, nine hundred eighty-nine thousand, seven hundred sixty-one".