838905 has 8 divisors (see below), whose sum is σ = 1342272. Its totient is φ = 447408.

The previous prime is 838897. The next prime is 838909. The reversal of 838905 is 509838.

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

It is not a de Polignac number, because 838905 - 2³ = 838897 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (838909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27949 + ... + 27978.

It is an arithmetic number, because the mean of its divisors is an integer number (167784).

2⁸³⁸⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

838905 is a deficient number, since it is larger than the sum of its proper divisors (503367).

838905 is a wasteful number, since it uses less digits than its factorization.

838905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55935.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 838905 is about 915.9175727106. The cubic root of 838905 is about 94.3128627712.

The spelling of 838905 in words is "eight hundred thirty-eight thousand, nine hundred five".