11855856 has 40 divisors (see below), whose sum is σ = 31962240. Its totient is φ = 3779776.

The previous prime is 11855839. The next prime is 11855869. The reversal of 11855856 is 65855811.

It is a super-2 number, since 2×11855856² = 281122642985472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4266 + ... + 6473.

It is an arithmetic number, because the mean of its divisors is an integer number (799056).

Almost surely, 2^11855856 is an apocalyptic number.

11855856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11855856 is an abundant number, since it is smaller than the sum of its proper divisors (20106384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11855856 is a wasteful number, since it uses less digits than its factorization.

11855856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10773 (or 10767 counting only the distinct ones).

The product of its digits is 48000, while the sum is 39.

The square root of 11855856 is about 3443.2333641506. The cubic root of 11855856 is about 228.0224662380.

The spelling of 11855856 in words is "eleven million, eight hundred fifty-five thousand, eight hundred fifty-six".