838009 has 4 divisors (see below), whose sum is σ = 840100. Its totient is φ = 835920.

The previous prime is 838003. The next prime is 838021. The reversal of 838009 is 900838.

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 308025 + 529984 = 555^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 838009 - 2⁹ = 837497 is a prime.

It is an Ulam number.

It is a Duffinian number.

838009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (838003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (210025).

2⁸³⁸⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

838009 is a deficient number, since it is larger than the sum of its proper divisors (2091).

838009 is a wasteful number, since it uses less digits than its factorization.

838009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 838009 is about 915.4283150526. The cubic root of 838009 is about 94.2792735773.

The spelling of 838009 in words is "eight hundred thirty-eight thousand, nine".