838000861 has 4 divisors (see below), whose sum is σ = 853812252. Its totient is φ = 822189472.

The previous prime is 838000841. The next prime is 838000879. The reversal of 838000861 is 168000838.

838000861 = 20469² + 20470².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 419020900 + 418979961 = 20470^2 + 20469^2 .

It is a cyclic number.

It is not a de Polignac number, because 838000861 - 2⁹ = 838000349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838000841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7905616 + ... + 7905721.

It is an arithmetic number, because the mean of its divisors is an integer number (213453063).

Almost surely, 2^838000861 is an apocalyptic number.

838000861 is the 20470-th centered square number.

It is an amenable number.

838000861 is a deficient number, since it is larger than the sum of its proper divisors (15811391).

838000861 is a wasteful number, since it uses less digits than its factorization.

838000861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15811390.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 838000861 is about 28948.2445236322. The cubic root of 838000861 is about 942.7896835322.

The spelling of 838000861 in words is "eight hundred thirty-eight million, eight hundred sixty-one", and thus it is an aban number.