838217047 has 2 divisors, whose sum is σ = 838217048. Its totient is φ = 838217046.

The previous prime is 838217021. The next prime is 838217057. The reversal of 838217047 is 740712838.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 838217047 - 2⁷ = 838216919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838217057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419108523 + 419108524.

It is an arithmetic number, because the mean of its divisors is an integer number (419108524).

Almost surely, 2^838217047 is an apocalyptic number.

838217047 is a deficient number, since it is larger than the sum of its proper divisors (1).

838217047 is an equidigital number, since it uses as much as digits as its factorization.

838217047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 838217047 is about 28951.9782916470. The cubic root of 838217047 is about 942.8707496407.

The spelling of 838217047 in words is "eight hundred thirty-eight million, two hundred seventeen thousand, forty-seven".