838638811 has 8 divisors (see below), whose sum is σ = 878768640. Its totient is φ = 798814632.

The previous prime is 838638793. The next prime is 838638839. The reversal of 838638811 is 118836838.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 838638811 - 2⁷ = 838638683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (838638841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70785 + ... + 81778.

It is an arithmetic number, because the mean of its divisors is an integer number (109846080).

Almost surely, 2^838638811 is an apocalyptic number.

838638811 is a deficient number, since it is larger than the sum of its proper divisors (40129829).

838638811 is a wasteful number, since it uses less digits than its factorization.

838638811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152825.

The product of its digits is 221184, while the sum is 46.

The square root of 838638811 is about 28959.2612302179. The cubic root of 838638811 is about 943.0288639227.

The spelling of 838638811 in words is "eight hundred thirty-eight million, six hundred thirty-eight thousand, eight hundred eleven".