838207861 has 2 divisors, whose sum is σ = 838207862. Its totient is φ = 838207860.

The previous prime is 838207849. The next prime is 838207873. The reversal of 838207861 is 168702838.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (838207849) and next prime (838207873).

It can be written as a sum of positive squares in only one way, i.e., 727326961 + 110880900 = 26969^2 + 10530^2 .

It is a cyclic number.

It is not a de Polignac number, because 838207861 - 2⁵ = 838207829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838207841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419103930 + 419103931.

It is an arithmetic number, because the mean of its divisors is an integer number (419103931).

Almost surely, 2^838207861 is an apocalyptic number.

It is an amenable number.

838207861 is a deficient number, since it is larger than the sum of its proper divisors (1).

838207861 is an equidigital number, since it uses as much as digits as its factorization.

838207861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 838207861 is about 28951.8196492034. The cubic root of 838207861 is about 942.8673053290.

The spelling of 838207861 in words is "eight hundred thirty-eight million, two hundred seven thousand, eight hundred sixty-one".