11921775 has 24 divisors (see below), whose sum is σ = 20196624. Its totient is φ = 6201600.

The previous prime is 11921773. The next prime is 11921827. The reversal of 11921775 is 57712911.

11921775 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 11921775 - 2¹ = 11921773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921773) 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, 1137 + ... + 5013.

It is an arithmetic number, because the mean of its divisors is an integer number (841526).

Almost surely, 2^11921775 is an apocalyptic number.

11921775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11921775 is a deficient number, since it is larger than the sum of its proper divisors (8274849).

11921775 is a wasteful number, since it uses less digits than its factorization.

11921775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931 (or 3926 counting only the distinct ones).

The product of its digits is 4410, while the sum is 33.

The square root of 11921775 is about 3452.7923482306. The cubic root of 11921775 is about 228.4442898786. Note that the first 3 decimals are identical.

The spelling of 11921775 in words is "eleven million, nine hundred twenty-one thousand, seven hundred seventy-five".