11856389 has 4 divisors (see below), whose sum is σ = 12265260. Its totient is φ = 11447520.

The previous prime is 11856373. The next prime is 11856409. The reversal of 11856389 is 98365811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98365811 = 43 ⋅2287577.

It can be written as a sum of positive squares in 2 ways, for example, as 6543364 + 5313025 = 2558^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 11856389 - 2⁴ = 11856373 is a prime.

It is a super-3 number, since 3×11856389³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11856329) 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, 204392 + ... + 204449.

It is an arithmetic number, because the mean of its divisors is an integer number (3066315).

Almost surely, 2^11856389 is an apocalyptic number.

It is an amenable number.

11856389 is a deficient number, since it is larger than the sum of its proper divisors (408871).

11856389 is an equidigital number, since it uses as much as digits as its factorization.

11856389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408870.

The product of its digits is 51840, while the sum is 41.

The square root of 11856389 is about 3443.3107614620. The cubic root of 11856389 is about 228.0258832317.

The spelling of 11856389 in words is "eleven million, eight hundred fifty-six thousand, three hundred eighty-nine".