11990721 has 8 divisors (see below), whose sum is σ = 16007904. Its totient is φ = 7983680.

The previous prime is 11990689. The next prime is 11990723. The reversal of 11990721 is 12709911.

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 11990721 - 2⁵ = 11990689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11990723) 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, 886 + ... + 4976.

It is an arithmetic number, because the mean of its divisors is an integer number (2000988).

Almost surely, 2^11990721 is an apocalyptic number.

It is an amenable number.

11990721 is a deficient number, since it is larger than the sum of its proper divisors (4017183).

11990721 is an equidigital number, since it uses as much as digits as its factorization.

11990721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 11990721 is about 3462.7620478456. The cubic root of 11990721 is about 228.8838232751.

The spelling of 11990721 in words is "eleven million, nine hundred ninety thousand, seven hundred twenty-one".