11821955 has 12 divisors (see below), whose sum is σ = 14449440. Its totient is φ = 9283872.

The previous prime is 11821913. The next prime is 11821961. The reversal of 11821955 is 55912811.

11821955 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 11821955 - 2⁶ = 11821891 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68249 + ... + 68421.

It is an arithmetic number, because the mean of its divisors is an integer number (1204120).

Almost surely, 2^11821955 is an apocalyptic number.

11821955 is a deficient number, since it is larger than the sum of its proper divisors (2627485).

11821955 is an frugal number, since it uses more digits than its factorization.

11821955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 257 counting only the distinct ones).

The product of its digits is 3600, while the sum is 32.

The square root of 11821955 is about 3438.3069961829. The cubic root of 11821955 is about 227.8049205983.

The spelling of 11821955 in words is "eleven million, eight hundred twenty-one thousand, nine hundred fifty-five".