11855869 has 2 divisors, whose sum is σ = 11855870. Its totient is φ = 11855868.

The previous prime is 11855839. The next prime is 11855881. The reversal of 11855869 is 96855811.

11855869 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11799225 + 56644 = 3435^2 + 238^2 .

It is a cyclic number.

It is not a de Polignac number, because 11855869 - 2⁹ = 11855357 is a prime.

It is a super-2 number, since 2×11855869² = 281123259490322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11855839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5927934 + 5927935.

It is an arithmetic number, because the mean of its divisors is an integer number (5927935).

Almost surely, 2^11855869 is an apocalyptic number.

It is an amenable number.

11855869 is a deficient number, since it is larger than the sum of its proper divisors (1).

11855869 is an equidigital number, since it uses as much as digits as its factorization.

11855869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 43.

The square root of 11855869 is about 3443.2352519106. The cubic root of 11855869 is about 228.0225495805.

The spelling of 11855869 in words is "eleven million, eight hundred fifty-five thousand, eight hundred sixty-nine".