8364781 has 2 divisors, whose sum is σ = 8364782. Its totient is φ = 8364780.

The previous prime is 8364773. The next prime is 8364793. The reversal of 8364781 is 1874638.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7650756 + 714025 = 2766^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 8364781 - 2³ = 8364773 is a prime.

It is a super-2 number, since 2×8364781² = 139939122355922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8364781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8364721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4182390 + 4182391.

It is an arithmetic number, because the mean of its divisors is an integer number (4182391).

Almost surely, 2^8364781 is an apocalyptic number.

It is an amenable number.

8364781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8364781 is an equidigital number, since it uses as much as digits as its factorization.

8364781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 8364781 is about 2892.1931125013. The cubic root of 8364781 is about 202.9947744697.

The spelling of 8364781 in words is "eight million, three hundred sixty-four thousand, seven hundred eighty-one".