4000781441 has 4 divisors (see below), whose sum is σ = 4066368084. Its totient is φ = 3935194800.

The previous prime is 4000781419. The next prime is 4000781461. The reversal of 4000781441 is 1441870004.

4000781441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1379751025 + 2621030416 = 37145^2 + 51196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4000781441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4000781461) 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, 32793230 + ... + 32793351.

It is an arithmetic number, because the mean of its divisors is an integer number (1016592021).

Almost surely, 2^4000781441 is an apocalyptic number.

It is an amenable number.

4000781441 is a deficient number, since it is larger than the sum of its proper divisors (65586643).

4000781441 is an equidigital number, since it uses as much as digits as its factorization.

4000781441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65586642.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 4000781441 is about 63251.7307352139. The cubic root of 4000781441 is about 1587.5044169261.

The spelling of 4000781441 in words is "four billion, seven hundred eighty-one thousand, four hundred forty-one".