11866859 has 4 divisors (see below), whose sum is σ = 12090816. Its totient is φ = 11642904.

The previous prime is 11866843. The next prime is 11866861. The reversal of 11866859 is 95866811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11866859 - 2⁴ = 11866843 is a prime.

It is a super-3 number, since 3×11866859³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11866259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111899 + ... + 112004.

It is an arithmetic number, because the mean of its divisors is an integer number (3022704).

Almost surely, 2^11866859 is an apocalyptic number.

11866859 is a deficient number, since it is larger than the sum of its proper divisors (223957).

11866859 is an equidigital number, since it uses as much as digits as its factorization.

11866859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223956.

The product of its digits is 103680, while the sum is 44.

The square root of 11866859 is about 3444.8307650740. The cubic root of 11866859 is about 228.0929842854.

The spelling of 11866859 in words is "eleven million, eight hundred sixty-six thousand, eight hundred fifty-nine".