11855864 has 16 divisors (see below), whose sum is σ = 22543920. Its totient is φ = 5844160.

The previous prime is 11855839. The next prime is 11855869. The reversal of 11855864 is 46855811.

It is a super-2 number, since 2×11855864² = 281123022372992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11855869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9869 + ... + 11004.

It is an arithmetic number, because the mean of its divisors is an integer number (1408995).

Almost surely, 2^11855864 is an apocalyptic number.

It is an amenable number.

11855864 is a deficient number, since it is larger than the sum of its proper divisors (10688056).

11855864 is a wasteful number, since it uses less digits than its factorization.

11855864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20950 (or 20946 counting only the distinct ones).

The product of its digits is 38400, while the sum is 38.

The square root of 11855864 is about 3443.2345258492. The cubic root of 11855864 is about 228.0225175257.

The spelling of 11855864 in words is "eleven million, eight hundred fifty-five thousand, eight hundred sixty-four".