11776721 has 8 divisors (see below), whose sum is σ = 13058688. Its totient is φ = 10530000.

The previous prime is 11776703. The next prime is 11776753. The reversal of 11776721 is 12767711.

It is a happy number.

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-11776721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11776771) 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, 8105 + ... + 9446.

It is an arithmetic number, because the mean of its divisors is an integer number (1632336).

Almost surely, 2^11776721 is an apocalyptic number.

11776721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11776721 is a deficient number, since it is larger than the sum of its proper divisors (1281967).

11776721 is a wasteful number, since it uses less digits than its factorization.

11776721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17623.

The product of its digits is 4116, while the sum is 32.

The square root of 11776721 is about 3431.7227452112. The cubic root of 11776721 is about 227.5140014729.

The spelling of 11776721 in words is "eleven million, seven hundred seventy-six thousand, seven hundred twenty-one".