11988855 has 24 divisors (see below), whose sum is σ = 20880288. Its totient is φ = 6363456.

The previous prime is 11988853. The next prime is 11988869. The reversal of 11988855 is 55888911.

11988855 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11988855 - 2¹ = 11988853 is a prime.

It is a super-2 number, since 2×11988855² = 287465288422050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11988855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11988853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11329 + ... + 12341.

It is an arithmetic number, because the mean of its divisors is an integer number (870012).

Almost surely, 2^11988855 is an apocalyptic number.

11988855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11988855 is a deficient number, since it is larger than the sum of its proper divisors (8891433).

11988855 is a wasteful number, since it uses less digits than its factorization.

11988855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287 (or 1284 counting only the distinct ones).

The product of its digits is 115200, while the sum is 45.

The square root of 11988855 is about 3462.4925992701. The cubic root of 11988855 is about 228.8719496668.

The spelling of 11988855 in words is "eleven million, nine hundred eighty-eight thousand, eight hundred fifty-five".