11721445 has 8 divisors (see below), whose sum is σ = 14085144. Its totient is φ = 9364224.

The previous prime is 11721443. The next prime is 11721473. The reversal of 11721445 is 54412711.

It can be written as a sum of positive squares in 4 ways, for example, as 66049 + 11655396 = 257^2 + 3414^2 .

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 11721445 - 2¹ = 11721443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721443) 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, 4417 + ... + 6553.

It is an arithmetic number, because the mean of its divisors is an integer number (1760643).

Almost surely, 2^11721445 is an apocalyptic number.

It is an amenable number.

11721445 is a deficient number, since it is larger than the sum of its proper divisors (2363699).

11721445 is a wasteful number, since it uses less digits than its factorization.

11721445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239.

The product of its digits is 1120, while the sum is 25.

The square root of 11721445 is about 3423.6595917235. The cubic root of 11721445 is about 227.1574848227.

The spelling of 11721445 in words is "eleven million, seven hundred twenty-one thousand, four hundred forty-five".