11644721 has 8 divisors (see below), whose sum is σ = 12801888. Its totient is φ = 10504000.

The previous prime is 11644709. The next prime is 11644723. The reversal of 11644721 is 12744611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11644721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11644723) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2600 + ... + 5481.

It is an arithmetic number, because the mean of its divisors is an integer number (1600236).

Almost surely, 2^11644721 is an apocalyptic number.

11644721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11644721 is a deficient number, since it is larger than the sum of its proper divisors (1157167).

11644721 is a wasteful number, since it uses less digits than its factorization.

11644721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8223.

The product of its digits is 1344, while the sum is 26.

The square root of 11644721 is about 3412.4362265103. The cubic root of 11644721 is about 226.6607714249.

It can be divided in two parts, 1164 and 4721, that added together give a palindrome (5885).

The spelling of 11644721 in words is "eleven million, six hundred forty-four thousand, seven hundred twenty-one".