11856919 has 2 divisors, whose sum is σ = 11856920. Its totient is φ = 11856918.

The previous prime is 11856899. The next prime is 11856947. The reversal of 11856919 is 91965811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11856919 - 2¹⁵ = 11824151 is a prime.

It is a super-2 number, since 2×11856919² = 281173056345122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11856979) 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 as a sum of consecutive naturals, namely, 5928459 + 5928460.

It is an arithmetic number, because the mean of its divisors is an integer number (5928460).

Almost surely, 2^11856919 is an apocalyptic number.

11856919 is a deficient number, since it is larger than the sum of its proper divisors (1).

11856919 is an equidigital number, since it uses as much as digits as its factorization.

11856919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 40.

The square root of 11856919 is about 3443.3877214162. The cubic root of 11856919 is about 228.0292808911.

The spelling of 11856919 in words is "eleven million, eight hundred fifty-six thousand, nine hundred nineteen".