3994871997 has 4 divisors (see below), whose sum is σ = 5326496000. Its totient is φ = 2663247996.

The previous prime is 3994871977. The next prime is 3994872017. The reversal of 3994871997 is 7991784993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (3994871977) and next prime (3994872017).

It is a de Polignac number, because none of the positive numbers 2^k-3994871997 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 (3994871927) 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 3 ways as a sum of consecutive naturals, for example, 665811997 + ... + 665812002.

It is an arithmetic number, because the mean of its divisors is an integer number (1331624000).

Almost surely, 2^3994871997 is an apocalyptic number.

It is an amenable number.

3994871997 is a deficient number, since it is larger than the sum of its proper divisors (1331624003).

3994871997 is a wasteful number, since it uses less digits than its factorization.

3994871997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331624002.

The product of its digits is 30862944, while the sum is 66.

The square root of 3994871997 is about 63204.9997784985. Note that the first 3 decimals coincide. The cubic root of 3994871997 is about 1586.7224121002.

The spelling of 3994871997 in words is "three billion, nine hundred ninety-four million, eight hundred seventy-one thousand, nine hundred ninety-seven".