3981720679 has 8 divisors (see below), whose sum is σ = 3999784320. Its totient is φ = 3963675000.

The previous prime is 3981720643. The next prime is 3981720709. The reversal of 3981720679 is 9760271893.

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 3981720679 - 2¹⁷ = 3981589607 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 (3981720629) 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, 644254 + ... + 650404.

It is an arithmetic number, because the mean of its divisors is an integer number (499973040).

Almost surely, 2^3981720679 is an apocalyptic number.

3981720679 is a deficient number, since it is larger than the sum of its proper divisors (18063641).

3981720679 is a wasteful number, since it uses less digits than its factorization.

3981720679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8981.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The square root of 3981720679 is about 63100.8770065837. The cubic root of 3981720679 is about 1584.9793081119.

The spelling of 3981720679 in words is "three billion, nine hundred eighty-one million, seven hundred twenty thousand, six hundred seventy-nine".