11718721 has 8 divisors (see below), whose sum is σ = 13419584. Its totient is φ = 10024560.

The previous prime is 11718709. The next prime is 11718739. The reversal of 11718721 is 12781711.

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

It is not a de Polignac number, because 11718721 - 2⁵ = 11718689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11718721.

It is not an unprimeable number, because it can be changed into a prime (11718761) 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, 2926 + ... + 5656.

It is an arithmetic number, because the mean of its divisors is an integer number (1677448).

Almost surely, 2^11718721 is an apocalyptic number.

It is an amenable number.

11718721 is a deficient number, since it is larger than the sum of its proper divisors (1700863).

11718721 is an equidigital number, since it uses as much as digits as its factorization.

11718721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351.

The product of its digits is 784, while the sum is 28.

The square root of 11718721 is about 3423.2617486836. The cubic root of 11718721 is about 227.1398867385.

The spelling of 11718721 in words is "eleven million, seven hundred eighteen thousand, seven hundred twenty-one".