4020289681 has 4 divisors (see below), whose sum is σ = 4020425712. Its totient is φ = 4020153652.

The previous prime is 4020289673. The next prime is 4020289699. The reversal of 4020289681 is 1869820204.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4020289681 - 2³ = 4020289673 is a prime.

It is a super-4 number, since 4×4020289681⁴ (a number of 40 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020289661) 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, 2911 + ... + 89716.

It is an arithmetic number, because the mean of its divisors is an integer number (1005106428).

Almost surely, 2^4020289681 is an apocalyptic number.

It is an amenable number.

4020289681 is a deficient number, since it is larger than the sum of its proper divisors (136031).

4020289681 is an equidigital number, since it uses as much as digits as its factorization.

4020289681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136030.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 4020289681 is about 63405.7543208816. The cubic root of 4020289681 is about 1590.0805150214.

The spelling of 4020289681 in words is "four billion, twenty million, two hundred eighty-nine thousand, six hundred eighty-one".