3994871999 has 4 divisors (see below), whose sum is σ = 4205128440. Its totient is φ = 3784615560.

The previous prime is 3994871977. The next prime is 3994872017. The reversal of 3994871999 is 9991784993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3994871999 - 2⁸ = 3994871743 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 (3994871899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105128192 + ... + 105128229.

It is an arithmetic number, because the mean of its divisors is an integer number (1051282110).

Almost surely, 2^3994871999 is an apocalyptic number.

3994871999 is a deficient number, since it is larger than the sum of its proper divisors (210256441).

3994871999 is a wasteful number, since it uses less digits than its factorization.

3994871999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210256440.

The product of its digits is 39680928, while the sum is 68.

The square root of 3994871999 is about 63204.9997943201. Note that the first 3 decimals coincide. The cubic root of 3994871999 is about 1586.7224123650.

The spelling of 3994871999 in words is "three billion, nine hundred ninety-four million, eight hundred seventy-one thousand, nine hundred ninety-nine".