3988247749 has 2 divisors, whose sum is σ = 3988247750. Its totient is φ = 3988247748.

The previous prime is 3988247717. The next prime is 3988247759. The reversal of 3988247749 is 9477428893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3171717124 + 816530625 = 56318^2 + 28575^2 .

It is a cyclic number.

It is not a de Polignac number, because 3988247749 - 2⁵ = 3988247717 is a prime.

It is a super-2 number, since 2×3988247749² = 31812240214807134002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3988247759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994123874 + 1994123875.

It is an arithmetic number, because the mean of its divisors is an integer number (1994123875).

Almost surely, 2^3988247749 is an apocalyptic number.

It is an amenable number.

3988247749 is a deficient number, since it is larger than the sum of its proper divisors (1).

3988247749 is an equidigital number, since it uses as much as digits as its factorization.

3988247749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24385536, while the sum is 61.

The square root of 3988247749 is about 63152.5751573125. The cubic root of 3988247749 is about 1585.8448989800.

The spelling of 3988247749 in words is "three billion, nine hundred eighty-eight million, two hundred forty-seven thousand, seven hundred forty-nine".