3989987749 has 16 divisors (see below), whose sum is σ = 4452200640. Its totient is φ = 3545071360.

The previous prime is 3989987741. The next prime is 3989987753. The reversal of 3989987749 is 9477899893.

It is a cyclic number.

It is not a de Polignac number, because 3989987749 - 2³ = 3989987741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989987741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94509 + ... + 130045.

It is an arithmetic number, because the mean of its divisors is an integer number (278262540).

Almost surely, 2^3989987749 is an apocalyptic number.

It is an amenable number.

3989987749 is a deficient number, since it is larger than the sum of its proper divisors (462212891).

3989987749 is a wasteful number, since it uses less digits than its factorization.

3989987749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35780.

The product of its digits is 246903552, while the sum is 73.

The square root of 3989987749 is about 63166.3498153883. The cubic root of 3989987749 is about 1586.0754905503.

The spelling of 3989987749 in words is "three billion, nine hundred eighty-nine million, nine hundred eighty-seven thousand, seven hundred forty-nine".