818378647 has 2 divisors, whose sum is σ = 818378648. Its totient is φ = 818378646.

The previous prime is 818378597. The next prime is 818378653. The reversal of 818378647 is 746873818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 818378647 - 2¹¹ = 818376599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 818378594 and 818378603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818378047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409189323 + 409189324.

It is an arithmetic number, because the mean of its divisors is an integer number (409189324).

Almost surely, 2^818378647 is an apocalyptic number.

818378647 is a deficient number, since it is larger than the sum of its proper divisors (1).

818378647 is an equidigital number, since it uses as much as digits as its factorization.

818378647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1806336, while the sum is 52.

The square root of 818378647 is about 28607.3180672359. The cubic root of 818378647 is about 935.3728567173.

It can be divided in two parts, 818378 and 647, that added together give a square (819025 = 905²).

The spelling of 818378647 in words is "eight hundred eighteen million, three hundred seventy-eight thousand, six hundred forty-seven".