8004781 has 2 divisors, whose sum is σ = 8004782. Its totient is φ = 8004780.

The previous prime is 8004743. The next prime is 8004797. The reversal of 8004781 is 1874008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7650756 + 354025 = 2766^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 8004781 - 2⁷ = 8004653 is a prime.

It is a super-2 number, since 2×8004781² = 128153037715922, which contains 22 as substring.

8004781 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8004181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4002390 + 4002391.

It is an arithmetic number, because the mean of its divisors is an integer number (4002391).

Almost surely, 2^8004781 is an apocalyptic number.

It is an amenable number.

8004781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8004781 is an equidigital number, since it uses as much as digits as its factorization.

8004781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 8004781 is about 2829.2721678905. The cubic root of 8004781 is about 200.0398337325.

Adding to 8004781 its reverse (1874008), we get a palindrome (9878789).

The spelling of 8004781 in words is "eight million, four thousand, seven hundred eighty-one".