11858209 has 4 divisors (see below), whose sum is σ = 12936240. Its totient is φ = 10780180.

The previous prime is 11858201. The next prime is 11858227. The reversal of 11858209 is 90285811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11858209 - 2³ = 11858201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11858201) 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, 538999 + ... + 539020.

It is an arithmetic number, because the mean of its divisors is an integer number (3234060).

Almost surely, 2^11858209 is an apocalyptic number.

It is an amenable number.

11858209 is a deficient number, since it is larger than the sum of its proper divisors (1078031).

11858209 is a wasteful number, since it uses less digits than its factorization.

11858209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078030.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 11858209 is about 3443.5750318528. The cubic root of 11858209 is about 228.0375502430.

The spelling of 11858209 in words is "eleven million, eight hundred fifty-eight thousand, two hundred nine".