1228686847 has 2 divisors, whose sum is σ = 1228686848. Its totient is φ = 1228686846.

The previous prime is 1228686799. The next prime is 1228686853. The reversal of 1228686847 is 7486868221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228686847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1228686794 and 1228686803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228687847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614343423 + 614343424.

It is an arithmetic number, because the mean of its divisors is an integer number (614343424).

Almost surely, 2^1228686847 is an apocalyptic number.

1228686847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228686847 is an equidigital number, since it uses as much as digits as its factorization.

1228686847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2064384, while the sum is 52.

The square root of 1228686847 is about 35052.6296731073. The cubic root of 1228686847 is about 1071.0598422357.

The spelling of 1228686847 in words is "one billion, two hundred twenty-eight million, six hundred eighty-six thousand, eight hundred forty-seven".