3994638719 has 8 divisors (see below), whose sum is σ = 4067329920. Its totient is φ = 3922113816.

The previous prime is 3994638667. The next prime is 3994638737. The reversal of 3994638719 is 9178364993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3994638719 - 2²⁰ = 3993590143 is a prime.

It is a super-2 number, since 2×3994638719² = 31914276990667921922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994638419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7424 + ... + 89690.

It is an arithmetic number, because the mean of its divisors is an integer number (508416240).

Almost surely, 2^3994638719 is an apocalyptic number.

3994638719 is a deficient number, since it is larger than the sum of its proper divisors (72691201).

3994638719 is an equidigital number, since it uses as much as digits as its factorization.

3994638719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83149.

The product of its digits is 8817984, while the sum is 59.

The square root of 3994638719 is about 63203.1543437509. The cubic root of 3994638719 is about 1586.6915262849.

The spelling of 3994638719 in words is "three billion, nine hundred ninety-four million, six hundred thirty-eight thousand, seven hundred nineteen".