42838209 has 12 divisors (see below), whose sum is σ = 62624016. Its totient is φ = 28214232.

The previous prime is 42838177. The next prime is 42838219. The reversal of 42838209 is 90283824.

It is not a de Polignac number, because 42838209 - 2⁵ = 42838177 is a prime.

It is a super-2 number, since 2×42838209² = 3670224300655362, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42838219) 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 11 ways as a sum of consecutive naturals, for example, 27927 + ... + 29420.

It is an arithmetic number, because the mean of its divisors is an integer number (5218668).

Almost surely, 2^42838209 is an apocalyptic number.

It is an amenable number.

42838209 is a deficient number, since it is larger than the sum of its proper divisors (19785807).

42838209 is a wasteful number, since it uses less digits than its factorization.

42838209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57436 (or 57433 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 42838209 is about 6545.0904501007. The cubic root of 42838209 is about 349.8998597865.

The spelling of 42838209 in words is "forty-two million, eight hundred thirty-eight thousand, two hundred nine".