11855840 has 24 divisors (see below), whose sum is σ = 28009800. Its totient is φ = 4742272.

The previous prime is 11855839. The next prime is 11855869. The reversal of 11855840 is 4855811.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 11855797 and 11855806.

It is a congruent number.

It is an unprimeable number.

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, 36890 + ... + 37209.

It is an arithmetic number, because the mean of its divisors is an integer number (1167075).

Almost surely, 2^11855840 is an apocalyptic number.

11855840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11855840 is an abundant number, since it is smaller than the sum of its proper divisors (16153960).

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

11855840 is an equidigital number, since it uses as much as digits as its factorization.

11855840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74114 (or 74106 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 11855840 is about 3443.2310407523. The cubic root of 11855840 is about 228.0223636625.

The spelling of 11855840 in words is "eleven million, eight hundred fifty-five thousand, eight hundred forty".