3985711999 has 24 divisors (see below), whose sum is σ = 4299935328. Its totient is φ = 3693281280.

The previous prime is 3985711997. The next prime is 3985712111. The reversal of 3985711999 is 9991175893.

It is not a de Polignac number, because 3985711999 - 2¹ = 3985711997 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 (3985711991) 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 in 23 ways as a sum of consecutive naturals, for example, 7649859 + ... + 7650379.

It is an arithmetic number, because the mean of its divisors is an integer number (179163972).

Almost surely, 2^3985711999 is an apocalyptic number.

3985711999 is a deficient number, since it is larger than the sum of its proper divisors (314223329).

3985711999 is a wasteful number, since it uses less digits than its factorization.

3985711999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 898 counting only the distinct ones).

The product of its digits is 5511240, while the sum is 61.

The square root of 3985711999 is about 63132.4955866628. The cubic root of 3985711999 is about 1585.5087314018.

The spelling of 3985711999 in words is "three billion, nine hundred eighty-five million, seven hundred eleven thousand, nine hundred ninety-nine".