3920743681 has 4 divisors (see below), whose sum is σ = 3929675200. Its totient is φ = 3911812164.

The previous prime is 3920743661. The next prime is 3920743793. The reversal of 3920743681 is 1863470293.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1863470293 = 26183 ⋅71171.

It is a cyclic number.

It is not a de Polignac number, because 3920743681 - 2⁵ = 3920743649 is a prime.

It is a super-2 number, since 2×3920743681² = 30744462024202859522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3920743601) 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, 4465101 + ... + 4465978.

It is an arithmetic number, because the mean of its divisors is an integer number (982418800).

Almost surely, 2^3920743681 is an apocalyptic number.

It is an amenable number.

3920743681 is a deficient number, since it is larger than the sum of its proper divisors (8931519).

3920743681 is an equidigital number, since it uses as much as digits as its factorization.

3920743681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8931518.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 3920743681 is about 62615.8420928761. The cubic root of 3920743681 is about 1576.8467369293.

The spelling of 3920743681 in words is "three billion, nine hundred twenty million, seven hundred forty-three thousand, six hundred eighty-one".