11867721 has 8 divisors (see below), whose sum is σ = 16046784. Its totient is φ = 7800240.

The previous prime is 11867719. The next prime is 11867731. The reversal of 11867721 is 12776811.

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

It is not a de Polignac number, because 11867721 - 2¹ = 11867719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11867711) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27646 + ... + 28071.

It is an arithmetic number, because the mean of its divisors is an integer number (2005848).

Almost surely, 2^11867721 is an apocalyptic number.

It is an amenable number.

11867721 is a deficient number, since it is larger than the sum of its proper divisors (4179063).

11867721 is an equidigital number, since it uses as much as digits as its factorization.

11867721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55791.

The product of its digits is 4704, while the sum is 33.

The square root of 11867721 is about 3444.9558778016. The cubic root of 11867721 is about 228.0985069878.

The spelling of 11867721 in words is "eleven million, eight hundred sixty-seven thousand, seven hundred twenty-one".