3985637749 has 2 divisors, whose sum is σ = 3985637750. Its totient is φ = 3985637748.

The previous prime is 3985637737. The next prime is 3985637819. The reversal of 3985637749 is 9477365893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3311196849 + 674440900 = 57543^2 + 25970^2 .

It is an emirp because it is prime and its reverse (9477365893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3985637749 - 2⁵ = 3985637717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3985637549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992818874 + 1992818875.

It is an arithmetic number, because the mean of its divisors is an integer number (1992818875).

Almost surely, 2^3985637749 is an apocalyptic number.

It is an amenable number.

3985637749 is a deficient number, since it is larger than the sum of its proper divisors (1).

3985637749 is an equidigital number, since it uses as much as digits as its factorization.

3985637749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34292160, while the sum is 61.

The square root of 3985637749 is about 63131.9075349383. The cubic root of 3985637749 is about 1585.4988858373.

The spelling of 3985637749 in words is "three billion, nine hundred eighty-five million, six hundred thirty-seven thousand, seven hundred forty-nine".