11955 has 8 divisors (see below), whose sum is σ = 19152. Its totient is φ = 6368.

The previous prime is 11953. The next prime is 11959. The reversal of 11955 is 55911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11955 - 2¹ = 11953 is a prime.

It is a plaindrome in base 14.

It is a zygodrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (11953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384 + ... + 413.

It is an arithmetic number, because the mean of its divisors is an integer number (2394).

2¹¹⁹⁵⁵ is an apocalyptic number.

11955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11955 is a deficient number, since it is larger than the sum of its proper divisors (7197).

11955 is an equidigital number, since it uses as much as digits as its factorization.

11955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805.

The product of its digits is 225, while the sum is 21.

The square root of 11955 is about 109.3389226214. The cubic root of 11955 is about 22.8656311480.

Subtracting 11955 from its reverse (55911), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 11955 in words is "eleven thousand, nine hundred fifty-five".