11721745 has 32 divisors (see below), whose sum is σ = 16796160. Its totient is φ = 7687680.

The previous prime is 11721733. The next prime is 11721763. The reversal of 11721745 is 54712711.

It is not a de Polignac number, because 11721745 - 2¹³ = 11713553 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 131661 + ... + 131749.

It is an arithmetic number, because the mean of its divisors is an integer number (524880).

Almost surely, 2^11721745 is an apocalyptic number.

It is an amenable number.

11721745 is a deficient number, since it is larger than the sum of its proper divisors (5074415).

11721745 is an equidigital number, since it uses as much as digits as its factorization.

11721745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its digits is 1960, while the sum is 28.

The square root of 11721745 is about 3423.7034042101. The cubic root of 11721745 is about 227.1594227711.

The spelling of 11721745 in words is "eleven million, seven hundred twenty-one thousand, seven hundred forty-five".