11921745 has 16 divisors (see below), whose sum is σ = 20809152. Its totient is φ = 5780160.

The previous prime is 11921729. The next prime is 11921753. The reversal of 11921745 is 54712911.

It is not a de Polignac number, because 11921745 - 2⁴ = 11921729 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 35962 + ... + 36291.

It is an arithmetic number, because the mean of its divisors is an integer number (1300572).

Almost surely, 2^11921745 is an apocalyptic number.

11921745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11921745 is a deficient number, since it is larger than the sum of its proper divisors (8887407).

11921745 is a wasteful number, since it uses less digits than its factorization.

11921745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72272.

The product of its digits is 2520, while the sum is 30.

The square root of 11921745 is about 3452.7880039180. The cubic root of 11921745 is about 228.4440982591. Note that the first 3 decimals are identical.

The spelling of 11921745 in words is "eleven million, nine hundred twenty-one thousand, seven hundred forty-five".